18Ar

Argon

Noble Gas

Argon (Ar) is element 18, a noble gas, in period 3 and group 18 of the periodic table. Its standard atomic weight is 39.948, it melts at -189.34 °C and boils at -185.85 °C. Discovered by Lord Rayleigh, 1894.

Atomic Number18

SymbolAr

NameArgon

Atomic Weight39.948 u

CategoryNoble Gas

Period3

Group18

Melting Point-189.34 °C

Boiling Point-185.85 °C

Density0.001633 g/cm³

Electron Config[Ne] 3s2 3p6

Discovered ByLord Rayleigh, 1894

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