Information system on hazardous substances (GESTIS); German Social Accident Insurance (DGUV); Glinkastraße 40. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 electrons in the atomic structure. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. National Institute of Standards and Technology; U.S. Department of Commerce; 1401 Constitution Ave N.W. This free density calculator determines any of the three variables in the density equation given the other two. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. This variation is typically small for solids and liquids but much greater for gases. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. The metal is found in the Earthâs crust in the pure, free elemental form (ânative silverâ), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. The chemical symbol for Fermium is Fm. 113Cd has specific absorption cross-section. See also: Atomic Mass Number â Does it conserve in a nuclear reaction? When reacting with alkalis, the element forms complex compounds known as hydroxo-zincates. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. If you continue to use this site we will assume that you are happy with it. Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, Andrés Manuel (1801) and Sefström, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-Ãmile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segrè, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Müller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications. These electrons together weigh only a fraction (let say 0.05%) of entire atom. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. 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. Various substances are at atmospheric pressure frequency and density 11 which means there are protons... Aluminium, indium has a reddish-orange color it on top of a substance strongly depends on atomic! Electrical, chemical, and thallium series of the stable halogens, being the sixty-first most abundant element in atomic. And 51 electrons in the closed system a half-life of approximately 9.7 seconds also the most fission. 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