18

Ar

Argon

39.948

Noble gas
Gas

Discovery

Ramsay, Sir William & Strutt, John (1894)

Etymology

Greek

Meaning

Inactive

Electron configuration

Electron configuration

Crystal structure

Crystal structure

Face-centered cubic

Physical Properties

Phase

  (at 21 °C and 101.325 kPa)

Gas

Melting point

  (at 101.325 kPa)

-189.0 °C

84.15 K

Boiling point

  (at 101.325 kPa)

-186.0 °C

87.15 K

Density

  (at 21 °C and 101.325 kPa)

0.86 g/cm3

Electronegativity

0.00