Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. The chemical symbol for Dysprosium is Dy. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Iron is a metal in the first transition series. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Europium is one of the least abundant elements in the universe. The bulk properties of astatine are not known with any certainty. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. 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. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. The chemical symbol for Terbium is Tb. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 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. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Helium Page One. 1) You may use almost everything for non-commercial and educational use. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. The chemical symbol for Ruthenium is Ru. It is this repeated pattern which control properties like strength, ductility, density, conductivity (property of conducting or transmitting heat, electricity, etc. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. 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. Its extreme rarity in the Earth’s crust, comparable to that of platinum. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. This can be determined using the atomic number and the mass number of the element (see the concept on atomic numbers and mass numbers). The chemical symbol for Scandium is Sc. 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. The chemical symbol for Antimony is Sb. A low resistivity indicates a material that readily allows the flow of electric current. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. 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. The chemical symbol for Bromine is Br. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. The chemical symbol for Berkelium is Bk. Approximately 60–70% of thallium production is used in the electronics industry. In nuclear industry, especially artificial xenon 135 has a tremendous impact on the operation of a nuclear reactor. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. The chemical symbol for Sodium is Na. Since their atomic number is the lowest, i guess that … Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Thulium is an easily workable metal with a bright silvery-gray luster. The chemical symbol for Lead is Pb. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. The chemical symbol for Promethium is Pm. Helium atom structure. 1) You may use almost everything for non-commercial and educational use. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier 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. In the perspective of quantum mechanics, helium is the second simplest atom to model, following the hydrogen atom. The darkness of the electron cloud corresponds to the line-of-sight integral over the probability function of the 1s atomic orbital of the electron. We use cookies to ensure that we give you the best experience on our website. We assume no responsibility for consequences which may arise from the use of information from this website. In solid-state physics, this energy gap or band gap is an energy range between valence band and conduction band where electron states are forbidden. Platinum is one of the least reactive metals. In the periodic table, potassium is one of the alkali metals. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Berkelium is a member of the actinide and transuranium element series. The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg. It is a soft, silvery-white alkali metal. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Neptunium metal is silvery and tarnishes when exposed to air. It is even less abundant than the so-called rare earths. ), and shape. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). The chemical symbol for Tellurium is Te. It is the same as the atomic structure of any other element. 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. Protons = 1. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. So a helium atom with two protons and one neutron is called helium-3, and a carbon atom with six protons and six neutrons is called carbon-12. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Fermium is a member of the actinide series. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. In metals, and in many other solids, the atoms are arranged in regular arrays called crystals. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The chemical symbol for Polonium is Po. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. The chemical symbol for Neptunium is Np. Neutrons = 0. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. Cerium is the second element in the lanthanide series. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. All of its isotopes are radioactive. As in Newtonian mechanics, no system that consists of more than two particles can be solved with an exact analytical mathematical approach (see 3-body problem) and helium is no exception. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. © 2019 periodic-table.org / see also Pure germanium is a semiconductor with an appearance similar to elemental silicon. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Uranium has the highest atomic weight of the primordially occurring elements. 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. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. Its boiling point is the lowest among all the elements. 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. The name semiconductor comes from the fact that these materials  have an electrical conductivity between that of a metal, like copper, gold, etc. al. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite. 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