Helium

Helium (2) (GASEOUS)
Atomic radius:.49Deg.A (Quantum mech. value for a free atom)
Atomic volume:
Atomic weight:4.0026 (Based on Carbon 12)
Boiling point:4.215Deg. Kelvin
Covalent radius:.93Deg.A
Crystal structure:Hexagonal
Density:.1787 g/l at 273Deg. Kelvin at 1 Atm.
Electrical conductivity:
Electron configuration:1s(2)
Electronegativity:
First ionization potential:24.587 (Pauling's)
Heat of fusion:
Heat of vaporization:.0845, kJ/mol at boiling point
Melting point:.95Deg. Kelvin
Oxidation states:None
Specific heat capacity:5.193, Jg(x.1) K(x.1) at 300Deg. Kelvin
Thermal conductivity:.00152, W cm(x.1) K(x.1) at 300Deg. Kelvin
Description:A light,colorless,nonflammable gaseous element found especially in
natural gases and used chiefly for inflating balloons,airships etc.,and for
filling incandescent lamps and cryogenic research.

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