Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Francium is a highly radioactive metal that decays into astatine, radium, and radon. There are only certain combinations of neutrons and protons, which forms stable nuclei. What is the symbol for the isotope? Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. Thulium is an easily workable metal with a bright silvery-gray luster. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Astatine is the rarest naturally occurring element on the Earth’s crust. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. The atomic number of selenium is 34. 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. Why don't libraries smell like bookstores? Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. Actinium is a soft, silvery-white radioactive metal. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Domů; Charakteristika; Tématické okruhy; O nás; Kontakt; Galerie; Dokumenty; ČSI web Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. The chemical symbol for Americium is Am. 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. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Arsenic is a metalloid. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. For example, a carbon atom weighs less than 2 × 10-23 g, and an electron has a charge of less than 2 × 10-19 C (coulomb). Titanium can be used in surface condensers. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Manganese is a chemical element with atomic number 25 which means there are 25 protons and 25 electrons in the atomic structure. The chemical symbol for Niobium is Nb. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. The chemical symbol for Neptunium is Np. Selenium is a chemical element with atomic number 34 which means there are 34 protons in its nucleus. The excess neutrons act somewhat like nuclear glue. Neutron Number and Mass Number of Selenium The chemical symbol for Hydrogen is H. 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