NO. 036Noble Gas

Kr

Krypton

Krypton is a noble gas used in lighting and photography, known for its low chemical reactivity.

Crystal Structure

Face-centered cubic (fcc)

Atomic Mass83.8 u

Density0.00375 g/cm³

Melting Point116 K

Boiling Point120 K

Atomic Radius88 pm

Electronegativity3

Ionization Energy1351 kJ/mol

Electron Affinity0 kJ/mol

Bonding TypeCovalent

Oxidation States0, 2

Acid/BaseNeutral

ReactivityLow

Electron Configuration

[Ar] 3d10 4s2 4p6

Discovered ByWilliam Ramsay

Year1898

Known Isotopes

Kr-78Kr-80Kr-82Kr-83Kr-84Kr-86