It is a synthetic element (first synthesised at Hasse in Germany) and radioactive. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. 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. 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 Lanthanum is La. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Neutron number is rarely written explicitly in nuclide symbol notation, but appears as a subscript to the right of the element symbol. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. The chemical symbol for Selenium is Se. This website does not use any proprietary data. See also: Densest Materials of the Earth. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Discoverer: Davy, Sir H. and Thénard, L.-J. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. The chemical symbol for Gadolinium is Gd. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. The chemical symbol for Promethium is Pm.  The density of Hassium results from its high atomic weight and from the significant decrease in ionic radii of the elements in the lanthanide series, known as lanthanide and actinide contraction. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. The chemical symbol for Thulium is Tm. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. 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. The chemical symbol for Krypton is Kr. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Elemental sulfur is a bright yellow crystalline solid at room temperature. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure.


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