tellurium

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Symbol:

Te

Atomic Number:

52

Relative Atomic Mass:

127.60 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

10^-6% (mass fraction)

Electron Configuration:

[Kr]4d¹⁰5s²5p⁴

Oxidation States:

VI, IV, -II

Atomic Radius:

143.2pm

Covalent Radius:

137pm

Ionic Radius:

97pm (for +4 oxidation state)

221pm (for -2 oxidation state)

Melting Point:

449.5°C

Density:

6.25 g cm^-3 (at 20°C)

First Ionisation Energy:

9.009 eV

Reduction Potential:

-1.143V

for Te + 2e^- a Te^2-

Electronegativity (Allred and Rochow):

2.0

Number of Natural Isotopes:

8

Mass Number of the Most Abundant Isotopes:

126 g mol^-1 a 19% abundance

128 g mol^-1 a 31.7% abundance

130 g mol^-1 a 33.8% abundance