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Atomic symbol - Ar
Atomic weight - 39.948
Atomic number - 18
Electron configuration - 2-8-8
Oxidation states - 0
State of matter - gas
Noble gas
Discovered in 1894 by Lord Rayleigh and Sir William Ramsay
Boils at -185.7 .C, melts at -189.2 .C

Notes:
Obtained from the fractional distillation of liquid air. Argon is used with
nitrogen in filling electric light bulbs. Argon with helium is used as an
inert atmosphere in scientific work.

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