zirconium

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Symbol:

Zr

Atomic Number:

40

Relative Atomic Mass:

91.224 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

0.02% (mass fraction)

Electron Configuration:

[Kr]4d²5s²

Oxidation States:

IV

Atomic Radius:

159pm

Covalent Radius:

145pm

Ionic Radius:

59pm (for +4 oxidation state, 4 coordinate)

72pm (for +4 oxidation state, 6 coordinate)

Melting Point:

1852°C

Density:

6.51 g cm^-3 (at 20°C)

First Ionisation Energy:

6.84 eV

Reduction Potential:

-1.553V

for ZrO₂ + 4H⁺ + 4e^- a Zr_(s) + 2H₂O

Electronegativity (Allred and Rochow):

1.2

Number of Natural Isotopes:

5

Mass Number of the Most Abundant Isotopes:

90 g mol^-1 a 51.5% abundance

92 g mol^-1 a 17.1% abundance

94 g mol^-1 a 17.4% abundance