PROMETHIUM

 PROMETHIUM (60) (Solid)  145(18 years)EC  147(2.62 years)B-

Atomic radius:2.62Deg. A (Quantum mech. value for a free atom)

Atomic volume:22.39 cm(3)/mol at 300Deg. Kelvin

Atomic weight:(145) most stable isotope based on Carbon 12

Boiling point:3785Deg. Kelvin

Covalent radius:1.63Deg. Kelvin

Crystal structure:Hexagonal

Density:6.4575 g/cm(3) at 300Deg. Kelvin

Electrical conductivity:

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

p(6)4f(5)6s(2)

Electronegativity:1.13 (Pauling's)

First ionization potential:5.554 V

Heat of fusion:

Heat of vaporization:

Melting point:1204Deg. Kelvin

Oxidation states:3 basic

Specific heat capacity:

Thermal conductivity:.179 W cm(x.1) K(x.1) at 300Deg. Kelvin

Description:A metallic element of the rare-earth group obtained as a fission

product of uranium or from neutron-irradiated neodymium.

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