HeZ =  2



Helium
From the Greek "helios", meaning "sun"
(AM) Atomic Mass 4.0026  amu    Oxidation States 0
   (BP) Boiling Point -268.9  °C    (MP) Melting Point -272.2  °C
   (ρ) Density 0.000178  g/cm3    Crystal Structure Hexagonal
   ( χ ) Electronegativity n/a    (AR) Atomic Radius n/a
   Physical State Gas (C) Heat Capacity 5.193  J/g °C
Electronic-Config 1s2     (I1) First Ionization E 2372.28  kJ/mol
   (ΔHvap) Heat of Vaporization 0.0829  kJ/mol     (ΔHfus) Heat of Fusion 0.0138  kJ/mol
   Year of Discovery 1895    Location of Discovery London
(E°) Standard Potential Inert
Stable isotopes  3He,  4He
Discovered/Synthesized by Pierre-Jules-CÚsar Janssen
Natural Source Isolated from the fractional distillation of natural gas
Common Uses Balloons, lasers, supercold refrigerant, cooling of MRI detectors
Other Info Smallest element
Its global supply is in critical shortage
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