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Symbol:

Si

Atomic Number:

14

Relative Atomic Mass:

28.0855 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

25.8% (mass fraction)

Electron Configuration:

[Ne]3s²3p²

Oxidation States:

IV, -IV

Atomic Radius:

117.6pm

Covalent Radius:

117pm

Ionic Radius:

26pm (for +4 oxidation state, 4 coordinate)

40pm (for +4 oxidation state, 6 coordinate)

Melting Point:

1410°C

Density:

2.33 g cm^-3 (at 20°C)

First Ionisation Energy:

8.151 eV

Electronegativity (Allred and Rochow):

1.7

Number of Natural Isotopes:

3

Mass Number of the Most Abundant Isotopes:

28 g mol^-1 a 92.2% abundance

29 g mol^-1 a 4.7% abundance

30 g mol^-1 a 3.1% abundance