scandium

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Symbol:

Sc

Atomic Number:

21

Relative Atomic Mass:

44.955910 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

5 x 10^-4% (mass fraction)

Electron Configuration:

[Ar]3d4s²

Oxidation States:

III

Atomic Radius:

160.6pm

Covalent Radius:

144pm

Ionic Radius:

75pm (for +3 oxidation state, 6 coordinate)

87pm (for +3 oxidation state, 8 coordinate)

Melting Point:

1539°C

Density:

2.99 g cm^-3 (at 20°C)

First Ionisation Energy:

6.54 eV

Reduction Potential:

-2.077V

for Sc³⁺ + 3e^- a Sc_(s)

Electronegativity (Allred and Rochow):

1.2

Number of Natural Isotopes:

1

Mass Number of the Most Abundant Isotopes:

45 g mol^-1 a 100% abundance