LANTHANUM

*LANTHANUM* (57) (Solid)  137(60,000 years)EC  140(40.3 hours)B-
Atomic radius:2.74Deg. A (Quantum mech. value for a free atom)
Atomic volume:20.73 cm(3)/mol at 300Deg. Kelvin
Atomic weight:138.9055 (Based on Carbon 12)
Boiling point:3730Deg. Kelvin
Covalent radius:1.69Deg. A
Crystal structure:Hexagonal
Density:6.7 g/cm(3) at 300Deg. Kelvin
Electrical conductivity:.126 10(x6) 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(6)4d(10)5s(2)p(6)
5d(1)6s(2)
Electronegativity:1.1 (Pauling's)
First ionization potential:5.58 V
Heat of fusion:6.2 kJ/mol at melting point
Heat of vaporization:414 kJ/mol at boiling point
Melting point:1193Deg. Kelvin
Oxidation states:3 very basic
Specific heat capacity:.19 Jg(x.1) K(x.1) at 300Deg. Kelvin
Thermal conductivity:.135 W cm(x.1) K(x.1) at 300Deg. Kelvin
Description:A white,soft,malleable metallic element that occurs in rare-earth
elements.

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