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. Le sélénium a été découvert en 1817 par Jöns Jacob Berzelius dans les boues des chambres de plomb utilisées pour la préparation de l'acide sulfurique. Pure germanium is a semiconductor with an appearance similar to elemental silicon. 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 |. Molecular Formula: Se +4: Synonyms: selenium(4+) Selenium, ion(4+) 22541-55-5. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. De plus, vingt-cinq isotopes radioactifs, de nombres de masse compris entre 64 et 94, ont été préparés par réactions nucléaires. The chemical symbol for Radium is Ra. The chemical symbol for Zinc is Zn. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. The chemical symbol for Cadmium is Cd. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Dans quelques complexes anioniques, les électrons 4 s son [...], 1 Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. The chemical symbol for Carbon is C. It is nonmetallic and tetravalentâmaking four electrons available to form covalent chemical bonds. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure.
The chemical symbol for Krypton is Kr. Actinium is a soft, silvery-white radioactive metal. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. consulté le 31 octobre 2020. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. 1) You may use almost everything for non-commercial and educational use. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium.
Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. The volume of an atom is about 15 orders of magnitude larger than the volume of a nucleus. Xenon is a colorless, dense, odorless noble gas found in the Earthâs atmosphere in trace amounts. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal.
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