One unified atomic mass unit isÂ approximatelyÂ the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. TheÂ chemical symbolÂ for Erbium isÂ Er. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. 7H consists of one proton and six neutrons. TheÂ chemical symbolÂ for Aluminum isÂ Al. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Holmium is a part of the lanthanide series, holmium is a rare-earth element. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. TheÂ chemical symbolÂ for Terbium isÂ Tb. Pure germanium is a semiconductor with an appearance similar to elemental silicon. al. Hafniumâs 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. It is extensively used in a large variety of industrial branches, from chemical industry (producing fertilizers, etc) to electronic (substance producing) and food industry, etc. Zirconium is widely used as a cladding for nuclear reactor fuels. TheÂ chemical symbolÂ for Dysprosium isÂ Dy. TheÂ chemical symbolÂ for Protactinium isÂ Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. TheÂ chemical symbolÂ for Astatine isÂ At. It is the fifth most abundant element in Earthâs crust and the third most abundant metal, after iron and aluminium. One tritium nucleus captures two neutrons from the other, becoming a nucleus with one proton and four neutrons. ActiniumÂ is a chemical element withÂ atomic numberÂ 89Â which means there are 89 protons and 89 electrons in the atomic structure. To identify the stability of an isotope it is needed to find the ratio ofÂ neutronsÂ toÂ protons. It is by mass the most common element on Earth, forming much of Earthâs outer and inner core. BismuthÂ is a chemical element withÂ atomic numberÂ 83Â which means there are 83 protons and 83 electrons in the atomic structure. 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 also the most corrosion-resistant metal, even at temperatures as high as 2000 Â°C. TheÂ chemical symbolÂ for Rhodium isÂ Rh. Its extreme rarity in the Earthâs crust, comparable to that of platinum. TheÂ chemical symbolÂ for Calcium isÂ Ca. Because of the extra neutron present in the nucleus, deuterium is roughly twice the mass of protium (deuterium has a mass of 2.014102 amu, compared to the mean hydrogen atomic mass of 1.007947 amu). TheÂ chemical symbolÂ for Nobelium isÂ No. It was first synthesized in 2003 by a group of Russian, Japanese and French scientists at RIKEN’s RI Beam Science Laboratory, by bombarding hydrogen with helium-8 atoms. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). TheÂ chemical symbolÂ for Sulfur isÂ S. Sulfur is abundant, multivalent, and nonmetallic. Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. CC BY-SA 3.0. http://en.wikipedia.org/wiki/Hydrogen_isotopes It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. BromineÂ is a chemical element withÂ atomic numberÂ 35Â which means there are 35 protons and 35 electrons in the atomic structure. Its properties are thus intermediate between those of chlorine and iodine. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. It has major applications in nuclear magnetic resonance studies. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. LithiumÂ is a chemical element withÂ atomic numberÂ 3Â which means there are 3 protons and 3 electrons in the atomic structure. TheÂ chemical symbolÂ for Polonium isÂ Po. BerylliumÂ is a chemical element withÂ atomic numberÂ 4Â which means there are 4 protons and 4 electrons in the atomic structure. TheÂ chemical symbolÂ for Tin isÂ Sn. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. In the periodic table, potassium is one of the alkali metals. Thulium is an easily workable metal with a bright silvery-gray luster. TheÂ chemical symbolÂ for Selenium isÂ Se. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. FranciumÂ is a chemical element withÂ atomic numberÂ 87Â which means there are 87 protons and 87 electrons in the atomic structure. As a result, as the number of protons increases,Â an increasing ratio of neutrons to protons is neededÂ to form a stable nucleus. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. 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. NitrogenÂ is a chemical element withÂ atomic numberÂ 7Â which means there are 7 protons and 7 electrons in the atomic structure. Francium is an alkali metal, that has one valence electron. Tungsten is an intrinsically brittle and hard material, making it difficult to work. Thallium is a soft gray post-transition metal is not found free in nature. EuropiumÂ is a chemical element withÂ atomic numberÂ 63Â which means there are 63 protons and 63 electrons in the atomic structure. In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. TheÂ chemical symbolÂ for Uranium isÂ U. TheÂ chemical symbolÂ for Beryllium isÂ Be. Naturally occurring tritium is extremely rare on Earth, where trace amounts are formed by the interaction of the atmosphere with cosmic rays. 2) You may not distribute or commercially exploit the content, especially on another website. Hydrogen is generally found as diatomic hydrogen gas H2, or it combines with other atoms in compounds—monoatomic hydrogen is rare. The difference between the neutron number and the atomic number is known as theÂ neutron excess: D = N â Z = A â 2Z. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Lawrencium is the final member of the actinide series. The most stable radioisotope of hydrogen is tritium, with a half-life of 12.32 years. At 0.099%, phosphorus is the most abundant pnictogen in the Earthâs crust. LanthanumÂ is a chemical element withÂ atomic numberÂ 57Â which means there are 57 protons and 57 electrons in the atomic structure. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. SamariumÂ is a chemical element withÂ atomic numberÂ 62Â which means there are 62 protons and 62 electrons in the atomic structure.
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