Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Weapons-grade plutonium … The chemical symbol for Holmium is Ho. Thulium is the thirteenth and third-last element in the lanthanide series. Plutonium has 15 isotopes with mass numbers ranging from 232 to 246. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Because uranium-238 is present in most nuclear fuel, plutonium-239 is continuously made in reactors. The chemical symbol for Plutonium is Pu . The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. None are stable. Plutonium is not magnetic. Elemental sulfur is a bright yellow crystalline solid at room temperature. At present, there are fifteen different isotopes of plutonium and each isotope is distinguished by its unique atomic mass (atomic mass is the sum mass of the protons and neutrons). The chemical symbol for Thulium is Tm. Plutonium is a key fissile component in modern nuclear weapons; care must be taken to avoid accumulation of amounts of plutonium which approach critical mass, the amount of plutonium which will self-generate a nuclear reaction. Plutonium is radiologically hazardous, particularly if inhaled, so must be handled with appropriate precautions. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. Although classified as a rare earth element, samarium is the 40th most abundant element in the Earth’s crust and is more common than such metals as tin. The chemical symbol for Lutetium is Lu. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Relative atomic mass The mass of an atom relative to that of carbon-12. The chemical symbol for Palladium is Pd. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Pure radium is silvery-white alkaline earth metal. 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. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. The chemical symbol for Dysprosium is Dy. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. The chemical symbol for Astatine is At. The chemical symbol for Nickel is Ni. 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. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. The chemical symbol for Iridium is Ir. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. It is an intensive property, which is mathematically defined as mass divided by volume: In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. The chemical symbol for Phosphorus is P. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. It is a radioactive metal in the actinide series. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. One atomic mass unit is equal to 1.66 x 10-24 grams. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. The chemical symbol for Indium is In. Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. Plutonium has 15 isotopes, with mass numbers falling between 232 and 246 (or thereabouts). These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). Mercury is commonly known as quicksilver and was formerly named hydrargyrum. The size and mass of atoms are so small that the use of normal measuring units, while possible, is often inconvenient. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Traces of plutonium isotopes Pu-238, Pu-239, Pu-240 and Pu-244 can be found naturally. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. It occurs on Earth as the decay product of various heavier elements. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Carbon is one of the few elements known since antiquity. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. 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). 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. Plutonium dioxide (PuO 2) Plutonium hydride (PuH 2) Plutonium fluoride (PuF 3) Interesting facts: It is found in uranium ores. 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. Plutonium ek chemical element hae, jiske chemical symbol Pu, atomic number 94 aur aomic mass 244 hae . The chemical symbol for Manganese is Mn. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. It is an actinide metal with a silvery-gray appearance but when oxidized it forms a dull coating. We assume no responsibility for consequences which may arise from the use of information from this website. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Neptunium metal is silvery and tarnishes when exposed to air. Actinium is a soft, silvery-white radioactive metal. Plutonium-239 is used in nuclear bombs. All of its isotopes are radioactive. There are two reasons for the difference between mass number and isotopic mass, known as the mass defect: Typical densities of various substances at atmospheric pressure. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. Isotopes: Plutonium has 17 whose half-lives are known, with mass numbers from 227 to 248. None are stable. Major advantage of lead shield is in its compactness due to its higher density. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. The chemical symbol for Samarium is Sm. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. Atomic Data for Plutonium (Pu) Plutonium (Pu) Atomic Data for Plutonium (Pu) Atomic Number = 94. PLUTONIUM-239. This chemistry video tutorial explains how to calculate the number of protons, neutrons, and electrons in an atom or in an ion. It is a soft, silvery-white alkali metal. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Lawrencium is the final member of the actinide series. The chemical symbol for Osmium is Os. In the process of splitting, a great amount of thermal energy, as well as gamma rays and two… Plutonium has 15 isotopes with mass numbers ranging from 232 to 246. Plutonium 239 is a fissile isotope and its fission cross-section for thermal neutrons is about 750 barns (for 0.025 eV neutron). 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. Plutonium's atomic mass is 244,064 204 (5) because the only naturally occurring isotope is 244Pu. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. The chemical symbol for Germanium is Ge. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. The atomic weight of Pu is approximately 244 grams per mole. The chemical symbol for Plutonium is Pu. The chemical symbol for Francium is Fr. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. The atomic mass is the mass of an atom. 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 Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Tin is a post-transition metal in group 14 of the periodic table. The chemical symbol for Hafnium is Hf. Unlike most metals, it is not a good conductor of heat or electricity. The chemical symbol for Bromine is Br. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. It is occasionally found in native form as elemental crystals. The chemical symbol for Zirconium is Zr. The name samarium is after the mineral samarskite from which it was isolated. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. Only about 5×10−8% of all matter in the universe is europium. The chemical symbol for Scandium is Sc. Radon is a radioactive, colorless, odorless, tasteless noble gas. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Exercise 4.76 Determine the number of protons and electrons in each ion. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. Neodymium is a soft silvery metal that tarnishes in air. It is the heaviest essential mineral nutrient. Plutonium is more likely to become critical in liquid solution than as a solid. The atomic number of plutonium is 94 and it is indicated by symbol is Pu. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. Plutonium is the second transuranic element with an atomic number of 94 and part of the actinide group of the periodic table. The primary decay modes of isotopes with mass numbers lower than the most stable isotope, plutonium-244, are spontaneous fission and α emission , mostly forming uranium (92 protons) and neptunium (93 protons) isotopes as decay products (neglecting the wide range of daughter nuclei created by fission processes). Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. Since the chemical characteristics of an element are governed by the number of pr… Plutonium isotopes range in mass number from 228 to 247. © 2019 periodic-table.org / see also 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. Cerium is the second element in the lanthanide series. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. For the other isotopes see the link below; mass number = number of protons + number of neutrons). The most stable isotope is Pu244. Atomic Mass of Plutonium Atomic mass of Plutonium is 244 u. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a … 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. It is now known to exist in oxidation states of +3, +4, +5, and +6. The half-life is the time it takes for half the atoms of an element to decay. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. It is very sensitive to changes in temperature, pressure, or chemistry. 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