Helium (He) in the periodic table — PeriodicTable

Helium (He) in the periodic tableHelium is element 2, a noble gas of the s block, in group 18, period 1. Its ground-state configuration is 1s2, and it usually shows the oxidation states 0.It was discovered in 1895, by Ramsay and Cleve.Name origin: the Greek helios, 'sun'. Blank rows are columns the sheet does not measure for this element.

Property

Value

Unit

Atomic weight

4.002602

Da

First ionisation energy

2372.3

kJ/mol

Covalent radius

69

pm

Van der Waals radius

140

pm

Melting point

0.956

K

Boiling point

4.22

K

Density

0.000179

g/cm³

Abundance

0.008

mg/kg

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