ArZ =  18

From the Greek "argon", meaning "inactive"
(AM) Atomic Mass 39.948  amu    Oxidation States 0
   (BP) Boiling Point -185.7  °C    (MP) Melting Point -189.2  °C
   (ρ) Density 0.001784  g/cm3    Crystal Structure Face Centered Cubic
   ( χ ) Electronegativity n/a    (AR) Atomic Radius 0.97  Å
   Physical State Gas (C) Heat Capacity 0.52  J/g °C
Electronic-Config [Ne]  3s2  3p6     (I1) First Ionization E 1520.51  kJ/mol
   (ΔHvap) Heat of Vaporization 6.43  kJ/mol     (ΔHfus) Heat of Fusion 1.18  kJ/mol
   Year of Discovery 1894    Location of Discovery Scotland
(E°) Standard Potential Inert
Stable isotopes  36Ar,  38Ar,  40Ar
Discovered/Synthesized by Sir William Ramsay, Lord Rayleigh
Natural Source Isolated from the liquifaction of air
Common Uses Light bulbs, neon tubes, lasers, welding gas
Other Info The third of the noble gases
Most comes from radioactive decay of 40-K
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