krypton

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Symbol:

Kr

Atomic Number:

36

Relative Atomic Mass:

83.80 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

2 x 10^-8% (mass fraction)

Electron Configuration:

[Ar]3d¹⁰4s²4p⁶

Oxidation States:

II

Van der Waals Radius:

190pm

Boiling Point:

-152.3°C

Density:

3.48 g L^-1 (at 1013 mbar)

First Ionisation Energy:

13.999 eV

Number of Natural Isotopes:

6

Mass Number of the Most Abundant Isotopes:

82 g mol^-1 a 11.6% abundance

84 g mol^-1 a 57.0% abundance

86 g mol^-1 a 17.3% abundance