sodium

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Symbol:

Na

Atomic Number:

11

Relative Atomic Mass:

22.989770 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

2.64% (mass fraction)

Electron Configuration:

[Ne]3s

Oxidation States:

I

Atomic Radius:

185.8pm

Covalent Radius:

157pm

Ionic Radius:

99pm (for +1 oxidation state, 4 coordinate)

102pm (for +1 oxidation state, 6 coordinate)

Melting Point:

97.8°C

Density:

0.97 g cm^-3 (at 20°C)

First Ionisation Energy:

5.139 eV

Reduction Potential:

-2.71V

for Na⁺ + e^- a Na_(s)

Electronegativity (Allred and Rochow):

1.0

Number of Natural Isotopes:

1

Mass Number of the Most Abundant Isotopes:

23 g mol^-1 a 100% abundance