magnesium

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Symbol:

Mg

Atomic Number:

12

Relative Atomic Mass:

24.3050 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

1.94% (mass fraction)

Electron Configuration:

[Ne]3s²

Oxidation States:

II

Atomic Radius:

159.9pm

Covalent Radius:

136pm

Ionic Radius:

57pm (for +2 oxidation state, 4 coordinate)

72pm (for +2 oxidation state, 6 coordinate)

Melting Point:

648.8°C

Density:

1.74 g cm^-3 (at 20°C)

First Ionisation Energy:

7.646 eV

Reduction Potential:

-2.372V

for Mg²⁺ + 2e^- a Mg_(s)

Electronegativity (Allred and Rochow):

1.2

Number of Natural Isotopes:

3

Mass Number of the Most Abundant Isotopes:

24 g mol^-1 a 79% abundance

25 g mol^-1 a 10% abundance

26 g mol^-1 a 11% abundance