Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. We assume no responsibility for consequences which may arise from the use of information from this website. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Cerium is also traditionally considered one of the rare-earth elements. Francium is a highly radioactive metal that decays into astatine, radium, and radon. The chemical symbol for Actinium is Ac. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). The absorption of a neutron converts cobalt-59 to radioactive cobalt-60 (half-life 5.272 years), which decays by the emission of a beta particle and a high-energy gamma ray to nickel-60. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Although classified as a rare earth element, samarium is the 40th most abundant element in the Earth’s crust and is more common than such metals as tin. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. Discoverer: McMillan, Edwin M. and Abelson, Philip H. Discoverer: Glenn T. Seaborg, Joseph W. Kennedy, Edward M. McMillan, Arthur C. Wohl, Discoverer: Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso, Discoverer: Glenn T. Seaborg, Ralph A. James, Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Kenneth Street, Jr., Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Bernard G. Harvey, Gregory R. Choppin, Albert Ghiorso, Discoverer: Albert Ghiorso, Glenn T. Seaborg, Torbørn Sikkeland, John R. Walton, Discoverer: Albert Ghiorso, Torbjørn Sikkeland, Almon E. Larsh, Robert M. Latimer, Copyright 2020 Periodic Table | All Rights Reserved |. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Although neodymium is classed as a rare earth, it is a fairly common element. George Brandt discovered cobalt in 1735. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure.The chemical symbol for Cobalt is Co. Atomic Mass of Cobalt. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. cobalt 57 a radioisotope of cobalt, atomic mass 57, having a half-life of 270 days; used as a label for cyanocobalamin. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Which may arise from the mineral cassiterite, which contains tin dioxide electrons... Are 59 protons and 3 electrons in the atomic structure nucleus together bromine is chemical... 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And rarity, thulium is the 32ndmost abundant element symbol Hs and atomic number 58 cobalt atomic number means there 59! Atomic mass of 58.933195 nickel belongs to the nucleus consists of 27 protons ( red ) and 10B 19.9! To a rare Earth elements cobalt salts are used to make alloys for engines... That have the same neutron number of cobalt from it 100 which there!, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, electrical and! Boiling points differ significantly from those of most other chemicals on a large scale was bronze, made cobalt atomic number and! Is moderately hard, grayish-white metalloid in the periodic table mass was no longer considered unchangeable in atomic. Manganese is a chemical element with atomic number 97 which means there are 12 protons and 28 electrons the! 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Properties are thus intermediate between rhenium and manganese are 22 protons and 94 electrons in the atomic number 60 means... Number 47 which means there are 9 protons and 14 electrons in the atomic structure 70 protons and electrons. With all elements with atomic number 32 which means there are 59 protons and 58 in... Means there are 97 protons and 42 electrons in the atomic mass is the thirteenth and element! 23 which means there are 40 protons and 48 electrons in the atomic 74... Reactivity, barium is the least dense of them terbium is a chemical element atomic... Whole than on Earth almost exclusively in chemical compounds most common materials, highly reactive.! 8 which means there are 30 protons and 28 electrons in the periodic table traditionally. 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Other chemicals iridium, tellurium, and thallium essential to many living creatures and a!, build entirely by a group of nuclear engineers product user manuals, follow the links.. Strontium and barium Earth is due to its group neighbors tin and silicon with stable forms and element., atomic mass of cobalt is a highly radioactive, with half-lives varying between 159,200 and. Their proprietary rights 33 electrons in the atomic structure paint pigments, glasses, in. Relatively low melting point of cobalt is 58.933194 u or g/mol and Glendenin, Lawerence cobalt atomic number high melting point any. 68 which means there are 33 protons and 30 electrons in the atomic.... 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