Krypton

Noble gas · 83.80 u · group 18, period 4

Krypton · Kr

Atomic number36

SymbolKr

CategoryNoble gas

Standard stateGas

Group · Period · Block18 · 4 · p

Electron configuration[Ar]4s2 3d10 4p6

Atomic mass83.80 u

Atomic radius202 pm

Protons / Neutrons / Electrons36 / 48 / 36

Shells (e⁻ per shell)2, 8, 18, 8

Electronegativity (Pauling)3

Ionization energy14 eV

Electron affinity—

Oxidation states0

Melting point115.8 K · -157.4 °C

Boiling point119.9 K · -153.2 °C

Density0.0037 g/cm³

Year discovered1898

CPK color

#5CB8D1

State at room temp (25 °C)

gas

Position