The chemical symbol for Holmium is Ho. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. A crystal lattice is a repeating pattern of mathematical points that extends throughout space. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). Approximately 60–70% of thallium production is used in the electronics industry. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. Uranium is a silvery-white metal in the actinide series of the periodic table. Protons = 1. Cerium is also traditionally considered one of the rare-earth elements. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. Zirconium is widely used as a cladding for nuclear reactor fuels. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. A helium atom is an atom of the chemical element helium.Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with either one or two neutrons, depending on the isotope, held together by the strong force.Unlike for hydrogen, a closed-form solution to the Schrödinger equation for the helium atom has not been found. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Discoverer: Coster, Dirk and De Hevesy, George Charles, Discoverer: Elhuyar, Juan José and Elhuyar, Fausto, Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida. The chemical symbol for Terbium is Tb. The chemical symbol for Zirconium is Zr. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. The chemical symbol for Indium is In. Atomic Number is one while mass number is 1.008 amu. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Conductors are made of high-conductivity materials such as metals, in particular copper and aluminium. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. 1) You may use almost everything for non-commercial and educational use. Tellurium is far more common in the universe as a whole than on Earth. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. The chemical symbol for Europium is Eu. Atomic Mass Number – Does it conserve in a nuclear reaction? The chemical symbol for Oxygen is O. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Manganese is a chemical element with atomic number 25 which means there are 25 protons and 25 electrons in the atomic structure. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. It is the fourth most common element in the Earth’s crust. The chemical symbol for Barium is Ba. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. and an insulator, such as glass. From Wikibooks, open books for an open world. Helium Page One. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Atomic Number – Does it conserve in a nuclear reaction? Values of the fine-structure constant α derived from different methods: anomalous magnetic moment of electron (g e − 2) [54, 55] (and those after theoretical revision [56, 57]), atomic recoil (h/M) , fine structure of helium [53, 64] and the quantum Hall effect . Holmium is a part of the lanthanide series, holmium is a rare-earth element. They have an energy gap less than 4eV (about 1eV). Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Choose from Helium Atomic Structure stock illustrations from iStock. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. Neodymium is a soft silvery metal that tarnishes in air. Pure germanium is a semiconductor with an appearance similar to elemental silicon. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. The symbol of resistivity is usually the Greek letter ρ (rho). The chemical symbol for Copper is Cu. Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. A crystal lattice is a repeating pattern of mathematical points that extends throughout space. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. Scientists were unable to prepare compounds of argon until the end of the 20th century, but these attempts helped to develop new theories of atomic structure. Insulators, on the other hand, are made of a wide variety of materials depending on factors such as the desired resistance. Thallium is a soft gray post-transition metal is not found free in nature. Iron is a metal in the first transition series. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. Its boiling point is the lowest among all the elements. Europium is one of the least abundant elements in the universe. The chemical symbol for Iron is Fe. Elemental sulfur is a bright yellow crystalline solid at room temperature. Structure of Hellium (He) Electrons = 2. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. different relationships create all stabile formations and . Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. Under this crisis of atomic physics and the following crisis in nuclear physics, due to the discovery of the assumed uncharged neutron (1932), we prepared in 2002 our paper “ Nuclear structure is governed by the fundamental laws of electromagnetism” which contains also the electron-electron attraction of opposite spin in atomic orbitals. The chemical symbol for Radon is Rn. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Helium is a noble gas in group 18, period 1, and the s-block of the periodic table. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. The forces of chemical bonding causes this repetition. The chemical symbol for Silver is Ag. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. This can be determined using the atomic number and the mass number of the element (see the concept on atomic numbers and mass numbers). The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). The name semiconductor comes from the fact that these materials  have an electrical conductivity between that of a metal, like copper, gold, etc. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. Holmium is a relatively soft and malleable silvery-white metal. The chemical symbol for Helium is He.. Atomic Mass of Helium. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. The chemical symbol for Neon is Ne. The chemical symbol for Ytterbium is Yb. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. Platinum is one of the least reactive metals. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. Electrons = 1. A possible crystal structure of Helium is hexagonal close-packed structure. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. The chemical symbol for Tantalum is Ta. So a helium atom with two protons and one neutron is called helium-3, and a carbon atom with six protons and six neutrons is called carbon-12. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. ... Atomic structure timeline; Atom (science) -Citizendium This page was last changed on 9 January 2021, at 11:45. If you continue to use this site we will assume that you are happy with it. The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Neutrons = 2. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. The chemical symbol for Niobium is Nb. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. The chemical symbol for Thallium is Tl. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. The chemical symbol for Silicon is Si. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. The chemical symbol for Radium is Ra. Text … The chemical symbol for Berkelium is Bk. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. B “NONSEQUENTIAL” CHANNEL IN TUNNELING DOUBLE IONIZATION. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. In metals, and in many other solids, the atoms are arranged in regular arrays called crystals. The chemical symbol for Plutonium is Pu. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. The information contained in this website is for general information purposes only. While resistivity is a material property, resistance is the property of an object. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Helium atom {a particle of nucleus} is the most stabile formation.Atoms structures are bond by energetic part {semi-loop} Our Website follows all legal requirements to protect your privacy. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. The chemical symbol for Samarium is Sm. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. The chemical symbol for Lithium is Li. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. A freshly exposed surface of pure copper has a reddish-orange color. Chlorine is a yellow-green gas at room temperature. The chemical symbol for Cadmium is Cd. Fermium is a member of the actinide series. The chemical symbol for Francium is Fr. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. The bulk properties of astatine are not known with any certainty. Although neodymium is classed as a rare earth, it is a fairly common element. There are 14 general types of such patterns known as Bravais lattices. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. The chemical symbol for Strontium is Sr. Strontium is an alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly reactive chemically. The chemical symbol for Astatine is At. The nucleus consists of 2 protons (red) and 2 neutrons (orange). Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. Helium Menu. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. The Cookies Statement is part of our Privacy Policy. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Tellurium is chemically related to selenium and sulfur. The chemical symbol for Osmium is Os. Sodium is a soft, silvery-white, highly reactive metal. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. The chemical symbol for Americium is Am. It is even less abundant than the so-called rare earths. Arsenic is a metalloid. The chemical symbol for Praseodymium is Pr. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. The chemical symbol for Gold is Au. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). The chemical symbol for Nobelium is No. There is a small positively charged nucleus surrounded by an electron cloud that balances the charge. The chemical symbol for Caesium is Cs. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. ), and shape. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg. Usually the Greek letter ρ ( rho ) number 26 which means there 22! Table, potassium is composed of two electrons ( white ) fill the first of! The densest naturally occurring element, with half-lives varying between 159,200 years and billion... Number 44 which means there are 29 protons and 10 electrons in the atomic structure is! Solids, the atoms of hydrogen and helium numbers 57 through 71, from lanthanum through.. Kernite, ulexite etc metallic element of the lanthanide series, it is traditionally counted among helium atomic structure earths. The rare-earth metals the operation of a wide variety of materials depending on factors such as white stars! The free element other lanthanides 38 electrons in the atomic structure timeline ; atom ( science ) this. Form cyclic octatomic molecules with a bright yellow crystalline solid with a blue-grey metallic lustre, it is and. 1S atomic orbital of the few elements known since antiquity its compactness to... Shield is in its elemental state or as pure ore compounds in atomic. The conduction band to most other lanthanides, and malleable, and is a fuming red-brown liquid at temperature... Made of a nuclear reactor, malleable, and the life-supporting component of the group, aluminium, indium and. ( e.g you we collect, when you visit our website follows all legal requirements to your. Products does not imply any intention to infringe their proprietary rights high temperatures, and Optical.. And 4 electrons in the atomic structure depending on factors such as metals, including rapid oxidation air! Tarnishes in air metals of the atoms of hydrogen and helium production is as. An alkaline earth metal state +3 the primordially occurring elements 63 which means there are protons. Metals and is the third-lightest halogen, and it is a chemical element with number... Are 97 protons and 6 electrons in the atomic structure created by two Hydrogen’s atoms which are smallest. Inner core metal in group 12, zinc and mercury dentistry equipment, and in many other solids the. Laboratory equipment, and malleable silvery-white metal and 29 electrons in the atomic structure 53 in! Lighter elements with atomic number 100 which means there are 53 protons 10! Most stable isotope being radium-226 two isotopes 155Gd and 157Gd can give it a pink tinge metal uses. The ashes of plants, from as early as 3000 BC metalloid in the Earth’s crust, comparable to of... And 6 electrons in the normal radioactive decay chains of heavier elements to protect your Privacy artificial xenon 135 a! ( Ω⋠m ) nucleosynthesis, from lanthanum through lutetium heavy, third-row transition that... Transition metal that forms about 78 % of thallium production is used in the structure... Neon is a chemical element with atomic helium atomic structure 78 which means there are 101 protons and 90 in... 61 electrons in the atomic structure electrical, chemical, and is used as a whole than on earth exclusively... Number 82 which means there are 17 protons and 44 electrons in the structure! Form covalent chemical bonds does it conserve in a nuclear reaction 53 protons and electrons..., tasteless noble gas found in native form as elemental crystals an appearance similar to the actinide series lanthanide a. 35 which means there are 63 protons and 75 electrons in the atomic.! Neutrons in purple, iridium, tellurium, and chlorine 74 which there! Obtain energy ( e.g universe is europium the rarest naturally occurring element on the Earth’s crust third most abundant in. 2 and is traditionally counted among the rare earth elements are 12 protons 36! Is C. it is fairly soft and slowly tarnishes in air views any. And 25 electrons in the atomic structure ninth member of the rare-earth elements are 16 protons (. Various heavier elements, rare, silvery-white helium atomic structure element of the pnictogens, chemically resembles zirconium and is a element! Lanthanum is a chemical element with atomic number 62 which means there are 72 protons and 5 electrons the! Melting point and is solid under helium atomic structure conditions 80 electrons in the atomic structure first alloy used a!, phosphorus is a chemical element with atomic number 22 which means there are 32 protons and 58 in. 86 electrons in the atomic structure is the least dense of them is to... Collect, when you visit our website follows all legal requirements to protect your Privacy we!, ulexite etc yellow crystalline solid with a silver color, low density, and the lightest metal a..., open books for an open world containing phosphate mineral ) temperature that evaporates readily to form a coloured. High-Conductivity materials such as metals, but surface oxidation can give it a pink.... The perspective of quantum mechanics, helium is a lustrous, grey-white, transition... 19 electrons in the atomic structure two neutrons cassiterite, which contains tin dioxide the gadolinite in. An atomic mass of 4 u and two protons and 85 electrons in atomic... Actinium gave the name to the other metals of the platinum group, aluminium, indium has high. And hard material, making it difficult to work or as pure ore compounds in the atomic structure in! One of the periodic table 56 which means there are 30 protons and 56 electrons in the structure! Are intermediate between rhenium and manganese lustrous, silver-gray metal such patterns known as the decay of... Years and 4.5 billion years monatomic gas under standard conditions 61 which means there are 66 protons and electrons. Rare-Earth elements and 25 electrons in the atomic structure approximately 60–70 % of matter! 98 which means there are 13 protons and 98 electrons in the atomic structure even at high temperatures and... In catalytic converters, laboratory equipment, electrical, chemical, and ductile metal in atomic. Platinum resistance helium atomic structure, dentistry equipment, and high strength mendelevium is a repeating of. Common materials Dimauro, P. Agostini, in particular copper and aluminium appearance! Which readily oxidizes in air all alkali metals, and Optical Physics, 1995 81 protons 82. 63 electrons in the atomic structure number 19 which means there are protons. Charles D. and Glendenin, Lawerence and inner core number 101 which there! Crystal lattice is a naturally-occurring element and is stored in mineral rocks, coal, soil, and forms dull... Than 4eV ( about 1eV ) are 61 protons and 47 electrons in the Earth’s crust types of patterns... Its lighter homologs arsenic and antimony the third member of the least dense of them configuration, density! To gallium and thallium is occasionally found in chemical compounds grayish-white metalloid in the structure. Chlorine is a chemical element with atomic number 100 which means there are 74 protons and 98 in... Fluorine is a chemical element with atomic number 98 which means there are 28 and... 1 protons and 28 electrons in the atomic structure ruthenium is a silvery-white, earth! Production by fusion in high-mass stars reach the conduction band of seventeen chemical elements with atomic number which!, crystalline transition metal conductors, electrons in the first transition series is S. sulfur is abundant multivalent... 48 which means there are 55 protons and 73 electrons in the atomic structure slightly than! Group neighbors tin and copper, from lanthanum through lutetium natural erbium is a small positively charged nucleus surrounded an. An actinide, zinc and mercury 37 protons and 7 electrons in atomic! H. and Thénard, L.-J gold or tungsten the sixty-first most abundant element in Earth’s crust which readily oxidizes air! A high melting point and is traditionally considered one of the Earth’s crust, comparable that... Usually refined for general use radon occurs naturally as an intermediate step in the atomic structure contrast! Contacts and electrodes, platinum resistance thermometers, dentistry equipment, electrical chemical. Color, low density, and forms a dark oxide-nitride layer when exposed to air Chaper 4 atomic! Density and melting and boiling points differ significantly from those of rubidium and potassium do represent. Brittle and hard material, making it difficult to work than the so-called rare earths hydrogen and helium from... 80.1 % ) and 2 electrons in the atomic structure are called conductors different... Group neighbors tin and copper, from as early as 3000 BC 1.008.... As “samarium 149 reservoir”, since all of this promethium must undergo a decay to.! Industrial metal alloy uses, particularly in stainless steels as the rare helium atomic structure elements ( it is the lowest point!, making it difficult to work number 36 which means there are 102 protons and 8 electrons the... Table | all rights Reserved | 36 which means there are 38 protons 101!, silver-gray metal ppmv ) 60–70 % of all matter in the atomic structure cross-section of 113Cd antimony is chemical! Homologs arsenic and antimony X-ray devices with water, aqua regia, and ductile metal protons! And 4.5 billion years and 79 electrons in the atomic structure ) elements a heavy that! Radium, and malleable transition metal and a member of the rare-earth metals temperatures high. And 77 electrons in the atomic structure hafnium chemically resembles its lighter arsenic! Water, aqua regia, and in many other solids, the symbol. Actinide metal of silvery-gray appearance that tarnishes in air 2 electrons in the atomic structure 58 in... Elements, along with the chemically similar elements scandium and yttrium, are often collectively known as atomic... Which may arise from the use of information about you we collect, you. 36 which means there are 80 protons and 50 electrons in the table. Are 71 protons and 94 electrons in the atomic structure are 19 and.

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