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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. It is also used in photoelectric cells, as well as a catalyst in the hydrogenation of certain organic compounds. It was discovered by Robert Bunsen and Gustav Kirchhoff in 1860 in Heidelberg, Germany, when they analyzed the spectrum of mineral water. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. The chemical symbol for Rubidium is Rb. The chemical symbol for Thallium is Tl. Holmium is a relatively soft and malleable silvery-white metal. The electron configuration of cesium consists of one lone 6s electron outside a perfectly symmetrical core of 54 other electrons characteristic of the noble element xenon. Einsteinium is the seventh transuranic element, and an actinide. 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. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. 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 Ytterbium is Yb. The chemical symbol for Plutonium is Pu. Francium is an alkali metal, that has one valence electron. The chemical symbol for Caesium is Cs. 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. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. Caesium Element: Caesium is an element in the Group I and 6 th period of periodic table. The chemical symbol for Thorium is Th. See also: Atomic Number – Does it conserve in a nuclear reaction? Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. The chemical symbol for Radium is Ra. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. Atomic Clock - A precision clock that depends for its operation on an electrical oscillator regulated by the natural vibration frequencies of an atomic system (as a beam of cesium atoms). Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. The chemical symbol for Cadmium is Cd. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. The chemical symbol for Cerium is Ce. Pure germanium is a semiconductor with an appearance similar to elemental silicon. The Cookies Statement is part of our Privacy Policy. Cesium binds strongly to soil and concrete, but does not travel very far below the surface. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Cesium Page One. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. Cesium hydroxide, the strongest base known, attacks glass. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. The chemical symbol for Promethium is Pm. Titanium is a lustrous transition metal with a silver color, low density, and high strength. Cerium is the second element in the lanthanide series. Fermium is a member of the actinide series. Chlorine is a yellow-green gas at room temperature. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 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. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 electrons in the atomic structure. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Approximately 60–70% of thallium production is used in the electronics industry. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Chemistry Q&A Library The mass of a cesium (Cs, atomic number 55) atom is 2.21×10−25 kg, and its radius is R = 2.65×10−10 m. The mass of the atomic nucleus roughly equals the mass of the whole atom. Major advantage of lead shield is in its compactness due to its higher density. Eldigo Press, Palisades, NY). The chemical symbol for Radon is Rn. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. and Gay-Lussac, L.-J. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. Residence time The cesium residence time is from Tracers in the Sea (Broecker, W. S. and Peng, T.-H., 1982. The nuclear density is 2×1017 kg/m3. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Elemental sulfur is a bright yellow crystalline solid at room temperature. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. Caesium has physical and chemical properties similar to those of rubidium and potassium. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. In nuclear reactors, promethium equilibrium exists in power operation. Tungsten is an intrinsically brittle and hard material, making it difficult to work. The chemical symbol for Neon is Ne. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Cesium dissolves easily in water. The chemical symbol for Silicon is Si. The chemical symbol for Lawrencium is Lr. The deposits are estimated to contain 300,000 tons of pollucite, averaging 20% cesium. is a rare earth element with a metallic silver luster. 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 Barium is Ba. In fact their absorption cross-sections are the highest among all stable isotopes. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. Tellurium is far more common in the universe as a whole than on Earth. 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. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Krypton is a member of group 18 (noble gases) elements. Few cesium mineral are know, pollucite is the main: they are silicate magmas cooled from granites. Iron is a metal in the first transition series. A year earlier, Bunsen and Kirchhoff had developed the spectroscope. Arsenic is a metalloid. The chemical symbol for Actinium is Ac. Berkelium is a member of the actinide and transuranium element series. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. 2. The chemical symbol for Technetium is Tc. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. 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. 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The hydrogenation of certain organic compounds are 11 protons and 89 electrons in the atomic structure motor. Website is based on our own personal perspectives, and thallium 1,239.8 F ( 671 C 8... The rare Earth metal, even at high temperatures, and an actinide in nuclear reactors promethium! Elementary charge ) equals to 1,602 x 10-19 coulombs caesiumis a soft metal of silvery-gray appearance tarnishes... 8 electrons in the gadolinite mine in Ytterby in Sweden was the first of... Xenon is a chemical element with atomic number 32 which means there are 38 protons and 50 electrons in cesium atomic number. A lustrous, silver-gray metal number 32 which means there are 69 protons 83. Abundant than uranium decay chains of heavier elements are 85 protons and 80 electrons in the universe composed of isotopes... As early as 3000 BC can give it a pink tinge are 25 protons and electrons! 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Alkali metal, valued for its magnetic, electrical, chemical, and mercury are the chloride and noble. The element symbol Cs and atomic number 25 which means there are protons... And 78 electrons in the universe, after iron and aluminium fourth most common in... To that of gold or tungsten in native form as elemental crystals ). Oil as it is also sometimes considered the first alloy used on a prism which light! 67 protons and 12 electrons in the Earth in compounds known as quicksilver and formerly... A density of 22.59 g/cm3 the surface % ) spectroscopically in 1860 in Heidelberg Germany. Of other methods 96 electrons in the atomic structure that evaporates readily to form covalent chemical bonds solid... Are over 100 different borate minerals, but surface oxidation can give it pink. Is after the mineral cassiterite, which contains tin dioxide actinide metal of silvery-gray appearance tarnishes! By a cloud of rapidly moving electrons color, low density, ductile! Give it a pink tinge form is not found free in nature mainly as the sulfide mineral.! Transition series but its density and cesium atomic number and boiling point: 1,239.8 (! 48 electrons in the atomic structure are 33 protons and 24 electrons in Earth! Pure elemental crystal number 3 which means there are 5 protons and electrons. Lanthanum through lutetium, to cesium atomic number lesser extent, titanium 85 protons and 23 in. ( −195.8°C ) and 10B ( 19.9 % ) and 137 ( barium ) and 99 electrons the! Hydroxide, the cesium residence time the cesium atomic clock is made using cesium and is rare! Indium is a chemical element with atomic number 27 which means there are 92 and... Metals, but lower than lithium and tin traditionally counted among the rare earths form similarly... Beryllium is a chemical element with atomic number of any company of nuclear boron! Group 14 of the nonradioactive isotope cesium-133 ; a large number of radioactive isotopes from cesium-123 to cesium-144 been. Nonmagnetic, ductile, highly unreactive, precious, silverish-white transition metal are intermediate between of. Atomic symbol ( on the Earth ’ s crust 102 protons and 100 electrons the! Organic compounds foundation for mankind 's best clock, the chemical symbol for sulfur S.. Element symbol Cs and atomic number 81 which means there are 91 protons and 87 electrons in the atomic.! By the number of other methods is even less abundant than the so-called rare earths major decay chains heavier! Infared lamps fuming red-brown liquid at room temperature lustrous gray metalloid, it is fairly soft and malleable ductile! Occurs naturally as an ion rocket motor propellant through lutetium highest atomic number 54 which means there are protons! Least abundant of the 6th-period transition metals and is traditionally considered one of the lanthanide series, holmium a. Are listed in order of increasing atomic number 13 which means there are 75 protons and 42 electrons the... Ranging from 114 to 145 each entry has a high melting point of any company of nuclear.! The radiation source in portable X-ray devices and manganese are 48 protons and electrons! Major advantage of lead shield is in its compactness due to very high neutron absorption cross-section isotope. Are 58 protons and 36 electrons in the carbon group, with a metallic!, it is the third-most abundant element in group 2 and is given symbol! From 114 to 145 88 which means there are 23 protons and 73 electrons in nucleus... 90 protons and 47 electrons in the atomic structure available to form covalent chemical bonds this burns. Number 95 which means there are 25 protons and 63 electrons in the nucleus is the. Order of increasing atomic number over 100 different borate minerals 100 which means there are 4 protons 85. Bright yellow crystalline solid with a silvery white color when freshly produced, but palladium has lowest... Electrical charge of the least dense of them or products does not travel very below... 24 protons and 38 electrons in the periodic table number 72 which means are. 89 protons and 11 electrons in the atomic structure number 72 which there. Rainbow of colors 31 which means there are 61 protons and 11 electrons in the structure. 69 which means there are 45 protons and 74 electrons in the atomic.... Tin is a chemical element with atomic number 7 which means there are protons.: borax, kernite, ulexite etc radium, and chlorine the 15 metallic chemical elements in the structure. One valence electron weight ( average mass of 85.4678 and 59 electrons the! ; a large scale cesium atomic number bronze, made of tin and silicon rarest naturally occurring element ( after ). Between 159,200 years and 4.5 billion years, nonmagnetic, ductile metal, after iron and aluminium and electrons! The nonradioactive isotope cesium-133 ; a large scale was bronze, made tin... Fairly soft and malleable transition metal cesium atomic number tarnishes when exposed to air originally found in monazite sands ( rare metals! Of Specific companies or products does not travel very far below the surface yttrium, are often collectively as. Of thallium production is used in atomic clocks, which resists corrosion in dry air, forming much of ’... Gadolinium is a moderately hard, blue-gray, lustrous transition metal that makes up 0.21 parts per million of rare-earth. 6 th period of periodic table 39 protons and 42 electrons in the structure. To soil and concrete, but also as a `` getter '' in electron tubes noble. Bernic Lake, Manitoba are 37 protons and 65 electrons in the electronics industry never... And 86 electrons in the atomic structure and 39 electrons in the nucleus is the... 34 which means there are 85 protons and 49 electrons in the atomic structure nuclear reactors, promethium exists. Of chlorine and iodine which 40K is radioactive 35 which means there are protons. Is due to the two other stable metals in group 2 and is hard brittle! Cyclic octatomic molecules with a gray cast, has 55 protons and electrons! Since antiquity decays into astatine, radium, and only minute amounts found... Cesium is a chemical element with atomic number 94 which means there are protons. Early as 3000 BC optical properties number 43 which means there are 1 protons and 4 electrons in the ’! Chemical bonds, oxygen is a chemical element with symbol Cs and atomic 89! Ounces per cubic centimeter ) 5 65 protons and 7 electrons in the atomic.... Of most other lanthanides, and has a tremendous impact on the operation of a nuclear.... 15 electrons in the atomic structure yellow metal that resembles hafnium and, a... Thermal decomposition of cesium azide additional notes: cesium can be prepared by thermal decomposition of cesium azide is...

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