Argon (Ar) in the periodic table — PeriodicTable

Argon (Ar) in the periodic tableArgon is element 18, a noble gas of the p block, in group 18, period 3. Its ground-state configuration is [Ne] 3s2 3p6, and it usually shows the oxidation states 0.It was discovered in 1894, by Ramsay and Rayleigh.Name origin: the Greek argos, 'idle'. Blank rows are columns the sheet does not measure for this element.

Property

Value

Unit

Atomic weight

39.948

Da

First ionisation energy

1520.6

kJ/mol

Covalent radius

97

pm

Van der Waals radius

188

pm

Melting point

83.8

K

Boiling point

87.3

K

Density

0.001784

g/cm³

Abundance

3.5

mg/kg

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