IRIDIUM

 IRIDIUM (77) (Solid)  192(74.2 days)B-,B+,EC

Atomic radius:1.87Deg. A (Quantum mech .value for a free atom)

Atomic volume:8.54 cm(3)/mol at 300Deg. Kelvin

Atomic weight:192.222 (Based on Carbon 12)

Boiling point:4701Deg. Kelvin

Covalent radius:1.27Deg. A

Crystal structure:Cubic,face centered

Density:22.5 g/cm(3) at 300Deg. Kelvin

Electrical conductivity:.197 10(x6) Ohm(x.1) cm(x.1) at 293Deg. Kelvin

Electron configuration:1s(2)2s(2)p(2)p(6)3s(2)p(6)3d(10)4s(2)p(6)4d(10)5s(2)

p(6)4f(14)5d(7)6s(2)

Electronegativity:2.2 (Pauling's)

First ionization potential:9.1 V

Heat of fusion:26.1 kJ/mol at melting point

Heat of vaporization:604 kJ/mol at boiling point

Melting point:2716Deg. Kelvin

Oxidation states:2,3,4,6,7 basic(7)

Specific heat capacity:.130 Jg(x.1) K(x.1) at 300Deg. Kelvin

Thermal conductivity:1.47 W cm(x.1) K(x.1) at 300Deg. Kelvin

Description:A silver-white,hard,brittle,very heavy metallic element of the

platinum group.

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