Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. 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. Electron Configuration and Oxidation States of Beryllium. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. This fact has key implications for the building up of the periodic table of elements. The chemical symbol for Actinium is Ac. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. 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. 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 2021 Periodic Table | All Rights Reserved |. Beryllium is a steel gray metal, and has many desirable properties. Beryllium oxide forms on the reaction of oxygen with beryllium. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. The chemical symbol for Xenon is Xe. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. Electron configuration of Beryllium is [He] 2s2. The chemical symbol for Thallium is Tl. Lv 4. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. Its boiling point is the lowest among all the elements. As its electron configuration shows, Be has 2 valence electrons located in the 2s subshell. Beryllium oxidation in dry oxygen has been studied over the temperature range, 500–900° C. Microscopic observations of oxidized surfaces have revealed that pits develop in the metal under the thin, adherent oxide film during the initial protective period of the oxidation and that these pits weaken and undermine the metal surface until metal fracture occurs. Cerium is the second element in the lanthanide series. Major advantage of lead shield is in its compactness due to its higher density. The chemical symbol for Astatine is At. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Elements with negative oxidation numbers are usually listed first. The change in oxidation state of an element during a reaction determines whether it has been oxidized or reduced without the use of electron-half-equations. It has a high permeability to X-rays and when bombarded by Alpha particles, as fro… Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. and Gay-Lussac, L.-J. Beryllium atomic number is 4 and the symbol is Be. Nickel is a silvery-white lustrous metal with a slight golden tinge. The chemical symbol for Lutetium is Lu. Its properties are thus intermediate between those of chlorine and iodine. In the gas phase the $\ce{BeCl2}$ monomer has a linear structure and the coordination number is 2. al. 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. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. 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