It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. The chemical symbol for Caesium is Cs. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. The chemical symbol for Arsenic is As. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. The chemical symbol for Radium is Ra. Oxidation states are typically represented by integers which may be positive, zero, or negative. Pure radium is silvery-white alkaline earth metal. Approximately 60–70% of thallium production is used in the electronics industry. The chemical symbol for Neptunium is Np. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. The chemical symbol for Cerium is Ce. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Pure germanium is a semiconductor with an appearance similar to elemental silicon. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. The chemical symbol for Antimony is Sb. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. The chemical symbol for Ruthenium is Ru. The chemical symbol for Einsteinium is Es. The chemical symbol for Rhenium is Re. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Electron configuration of Thallium is [Hg] 6p1. All of its isotopes are radioactive. The chemical symbol for Cadmium is Cd. Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. The chemical symbol for Silicon is Si. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. The chemical symbol for Berkelium is Bk. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. 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). Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. If you continue to use this site we will assume that you are happy with it. The chemical symbol for Krypton is Kr. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. Neodymium is a soft silvery metal that tarnishes in air. The chemical symbol for Chlorine is Cl. Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. The chemical symbol for Germanium is Ge. The chemical symbol for Molybdenum is Mo. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. Hafnium’s large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. Discoverer: Coster, Dirk and De Hevesy, George Charles, Discoverer: Elhuyar, Juan José and Elhuyar, Fausto, Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida. © 2019 periodic-table.org / see also

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