OSMIUM

 OSMIUM (76) (Solid)  194(6 years)B-

Atomic radius:1.92Deg. A (Quantum mech. value for a free atom)

Atomic volume:8.49 cm(3)/mol at 300Deg. Kelvin

Atomic weight:190.3 (Based on Carbon 12)

Boiling point:5285Deg. Kelvin

Covalent radius:1.26Deg. A

Crystal structure:Hexagonal

Density:22.4 g/cm(3) at 300Deg. Kelvin

Electrical conductivity:.109 10(x.1) Ohm(x.1( K(x.1) at 293Deg. Kelvin

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

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

Electronegativity:2.2 (Pauling's)

First ionization potential:8.7 V

Heat of fusion:31.8 kJ/mol at melting point

Heat of vaporization:746 kJ/mol at boiling point

Melting point:3300Deg. Kelvin

Oxidation states:2,3,4,6,8 acidic(8)

Specific heat capacity:.13 Jg(x.1) K(x.1) at 300Deg. Kelvin

Thermal conductivity:.876 W cm(x.1) K(x.1) at 300Deg. Kelvin

Description:A hard,brittle,blue-gray or blue-black polyvalent metallic element

of the platinum group with a high melting point,that is the heaviest metal

known and that is used especially as a catalyst in hard alloys.

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