chromium

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Symbol:

Cr

Atomic Number:

24

Relative Atomic Mass:

51.9961 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

0.02% (mass fraction)

Electron Configuration:

[Ar]3d⁵4s

Oxidation States:

VI, III, II, 0

Atomic Radius:

124.9pm

Covalent Radius:

118pm

Ionic Radius:

26pm (for +6 oxidation state)

61pm (for +3 oxidation state)

(Values are for high-spin complexes)

Melting Point:

1857°C

Density:

7.14 g cm^-3 (at 20°C)

First Ionisation Energy:

6.766 eV

Reduction Potential:

-0.744V

for Cr³⁺ + 3e^- a Cr_(s)

Electronegativity (Allred and Rochow):

1.6

Number of Natural Isotopes:

4

Mass Number of the Most Abundant Isotopes:

50 g mol^-1 a 4.3% abundance

52 g mol^-1 a 83.8% abundance

53 g mol^-1 a 9.6% abundance