Ar	Z =  18	◊ ◊ ◊ ◊ ◊	Argon
			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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