Aluminium

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Symbol:

Al

Atomic Number:

13

Relative Atomic Mass:

26.981538 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

7.57% (mass fraction)

Electron Configuration:

[Ne]3s²3p

Oxidation States:

+III

Atomic Radius:

143.2pm

Covalent Radius:

125pm

Ionic Radius:

39pm (for +3 oxidation state, 4 coordinate)

54pm (for +3 oxidation state, 6 coordinate)

Melting Point:

660.4°C

Density:

2.70 g cm^-3 (at 20°C)

First Ionisation Energy:

5.986 eV

Reduction Potential:

-1.662V

for Al³⁺ + 3e^- a Al_(s)

Electronegativity (Allred and Rochow):

1.5

Number of Natural Isotopes:

1

Mass Number of the Most Abundant Isotopes:

27 g mol^-1 a 100% abundance