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Atomic Number	36

Atomic Symbol	Kr

Atomic Weight	83.80 amu

Group	Noble Gas, 18

Form	Gas

Density @ STP	3.677 g/L

Melting Point	-157.36 °C (-251.248 °F, 115.79 °K)

Boiling Point	-153.22 °C (-243.796 °F, 119.93 °K)

Heat of Fusion	1.37 kJ/mol

Heat of Vaporization	9.08 kJ/mol

First Ionization Potential	13.99961 eV

Specific Heat Capacity	0.248 J/g K

Ground State Electron Configuration	4p⁶

Oxidation State(s)	0

Stable Isotopes and Natural Abundance on Earth	⁷⁸Kr, 0.35%; ⁸⁰Kr, 2.25%; ⁸²Kr, 11.61%; ⁸³Kr, 11.5%; ⁸⁴Kr, 57.0%; ⁸⁶Kr, 17.3%

Selected Radioisotopes	⁸¹Kr

Atomic Radius	88 pm

Crystal Structure	Cubic

Discovered by	Ramsay; Travers, 1898