Name :  Argon
Symbol :  Ar
Atomic Number :  18
Atomic Weight :  39.948
Specific Heat :  0.520 J/gK
Melting Point :  -189.2°C
Vaporization :  6.447 kJ/mol
Boiling Point :  -185.7°C
Electronegativity :  0
Density@293 K :  0.0017824 g/cm³
Discovered :  Sir William Ramsey, Baron Rayleigh, Scotland, 1894
Description :  Colorless, odorless, tasteless noble gas. It is the third most abundant element in the earth\'s atmosphere and makes up about 1%.
Uses :  Used in lighting products. It is often used in filling incandescent light bulbs. Some is mixed with krypton in fluorescent lamps. Crystals in the semiconductor industry are grown in argon atmospheres.