Helium is non reactive element, so it is used as an inert gas shield in robotic Arc welding. Naming: After Helios, (Greek Titan of the sun)ĭiscovery: Pierre Janssen, Norman Lockyer (1868)įirst isolation:Willian Ramsay, Per Teodor cleve, Abraham Langlet (1895), London (England) / Uppsala (Sweden) Helium Uses It doesn’t react with Air, Water, Halogens, Acid, Bases etc… Fission and Fusion Equations:įission Reaction of Uranium 235 (U-235) Bombarded by Neutrons:ġ 0n + 235 92U → 141 56Ba + 92 36Kr + 3 1 0nģ 2He + 3 2He → 4 2He + 2 1 1P + 12.85 MeV orĭ ( 2 1H) + 3 2He → 4 2He + 1 1P + 18.4 MeV Helium History Hexagonal Close Packed (HCP) Reactivity of HeliumĮlectron affinity: 0 kJ/mol Nuclear Properties of Helium Ionization energies: 1st: 2372.2 kJ.mol 2nd: 5250.5 kJ/molĬrystal structure: Hexagonal close-packed The ionization potential of an atom: 24.47 eV Sound Speed: 972 m/s Atomic Properties of Helium Molar magnetic susceptibility: -236×10 -9 m 3/mol Physical Properties of Heliumĭensity: 0.178 g/L (at STP) 0.145 g/cm 3 (In Liquid at M.P) Mass magnetic susceptibility: -5.9×10 -9 m 3/kg Magnetic susceptibility (x mol): -1.88×10 -6 cm 3/mol Neel Point (magnetic ordering temperature) T N: N/A Electrical properties of HeliumĬritical point (Superconducting point): N/A Magnetic Properties of Helium Helium Electron Configuration Thermal Properties of Helium It is the only element that cannot be solidified by lowering the temperature, It remains liquid down to absolute zero at normal pressures, but it can readily solidify by increasing the pressure. It has many unique properties such as low density, low boiling point, low solubility, high thermal conductivity and inertness (less reactive). Helium is a Odourless, Colourless, insipid and non-toxic gas. Bibliographic Databases on Atomic Spectroscopy.
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