In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. In nuclear reactors, promethium equilibrium exists in power operation. The chemical symbol for Tin is Sn. Krypton is a member of group 18 (noble gases) elements. Fermium is a member of the actinide series. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. The chemical symbol for Beryllium is Be. 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-Émile, 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. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. Although neodymium is classed as a rare earth, it is a fairly common element. The chemical symbol for Holmium is Ho. The chemical symbol for Silicon is Si. Potassium: Symbol: K: Atomic Number: 19: Atomic Mass: 39.0983 atomic mass units: Number of Protons: 19: Number of Neutrons: 20: Number of Electrons: 19: Melting Point: 63.65° C: Boiling Point: 774.0° C: Density.862 grams per cubic centimeter: Normal Phase: Solid: Family: Alkali Metals: Period: 4 Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. Elemental sulfur is a bright yellow crystalline solid at room temperature. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Thorium is moderately hard, malleable, and has a high melting point. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. Neptunium is the first transuranic element. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. The chemical symbol for Iridium is Ir. The chemical symbol for Cadmium is Cd. 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 Rhodium is Rh. Gold is a transition metal and a group 11 element. In the periodic table, potassium is one of the alkali metals. Thulium is the thirteenth and third-last element in the lanthanide series. Francium is an alkali metal, that has one valence electron. It is fairly soft and slowly tarnishes in air. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. The chemical symbol for Sodium is Na. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. 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. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. 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 |. Pure germanium is a semiconductor with an appearance similar to elemental silicon. The chemical symbol for Aluminum is Al. Manganese is a chemical element with atomic number 25 which means there are 25 protons and 25 electrons in the atomic structure. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). Chemically, indium is similar to gallium and thallium. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized.

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