nickel

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Symbol:

Ni

Atomic Number:

28

Relative Atomic Mass:

58.6934 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

0.01% (mass fraction)

Electron Configuration:

[Ar]3d⁸4s²

Oxidation States:

III, II, 0

Atomic Radius:

124.6pm

Covalent Radius:

115pm

Ionic Radius:

55pm (for +2 oxidation state, 4 coordinate)

69pm (for +2 oxidation state, 6 coordinate)

Melting Point:

1453°C

Density:

8.91 g cm^-3 (at 20°C)

First Ionisation Energy:

7.635 eV

Reduction Potential:

-0.257V

for Ni²⁺ + 2e^- a Ni_(s)

Electronegativity (Allred and Rochow):

1.8

Number of Natural Isotopes:

5

Mass Number of the Most Abundant Isotopes:

58 g mol^-1 a 68.1% abundance

60 g mol^-1 a 26.2% abundance

62 g mol^-1 a 3.6% abundance