The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. The chemical symbol for Chlorine is Cl. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. Chlorine is a yellow-green gas at room temperature. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Scandium, atomic number 21. Atomic Mass of Scandium Atomic mass of Scandium is 44.9559 u. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Metallic scandium was first produced in 1937 and the first pound (0.45 kilograms) of pure scandium was produced in 1960. Tellurium is chemically related to selenium and sulfur. [4] As is observed for most elements, a diatomic scandium hydride has been observed spectroscopically at high temperatures in the gas phase. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. The bulk properties of astatine are not known with any certainty. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Discoverer: Davy, Sir H. and Thénard, L.-J. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. 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. The chemical symbol for Iron is Fe. Compare the atomic properties of Scandium and Moscovium. The chemical symbol for Neodymium is Nd. It is classified as a transition metal or rare earth metal. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. 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. Scandium has an atomic no. The chemical symbol for Caesium is Cs. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. The chemical symbol for Cerium is Ce. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. 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. The chemical symbol for Californium is Cf. The chemical symbol for Boron is B. In nuclear industry, especially artificial xenon 135 has a tremendous impact on the operation of a nuclear reactor. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. [38] Aluminium-scandium alloys were also developed in the USSR. Lead is a heavy metal that is denser than most common materials. However, titanium alloys, which are similar in lightness and strength, are cheaper and much more widely used. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. The chemical symbol for Indium is In. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. Arsenic is a metalloid. In metals, and in many other solids, the atoms are arranged in regular arrays called crystals. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Third Energy Level: Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. The chemical symbol for Barium is Ba. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. Scandium (Sc). Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Elemental sulfur is a bright yellow crystalline solid at room temperature. Only about 5×10−8% of all matter in the universe is europium. 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. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Uranium has the highest atomic weight of the primordially occurring elements. These have made Al3Sc somewhat competitive with titanium alloys along with a wide array of applications. It has the atomic symbol Sc, atomic number 21, and atomic weight 45. Atomic Number of Scandium Atomic Number of Scandium is 21. The chemical symbol for Rubidium is Rb. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Twenty-five radioisotopes have been characterized, with the most stable being 46 Sc with a half-life of 83.8 days, 47 Sc with a half-life of 3.35 days, and 48 Sc with a half-life of 43.7 hours and 44 Sc with a half-life of 3.97 hours. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. The chemical symbol for Xenon is Xe. The chemical symbol for Europium is Eu. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Therefore electronic configuration of scandium(Sc) is: 1s2 2s2 2p6 3s2 3p6 3d1 4s2. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Scandum oxide (Sc2O3) is used in the manufacture of high-intensity electric lamps. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. The chemical symbol for Lead is Pb. The chemical symbol for Thulium is Tm. 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