HAFNIUM

HAFNIUM (72) (Solid)
Atomic radius:2.16Deg. A (Quantum mech. value for a free atom)
Atomic volume:13.6 cm(3)/mol at 300Deg. Kelvin
Atomic weight:178.49 (Based on Carbon 12)
Boiling point:4876Deg. Kelvin
Covalent radius:1.44Deg. A
Crystal structure:Hexagonal
Density:13.1 g/cm(3) at 300Deg. Kelvin
Electrical conductivity:.0312 10(x6) Ohm(x.1) cm(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)
4f(14)5d(2)6s(2)
Electronegativity:1.3 (Pauling's)
First ionization potential:6.55 V
Heat of fusion:24.06 kJ/mol at melting point
Heat of vaporization:575 kJ/mol at boiling point
Melting point:2500Deg. Kelvin
Oxidation states:4 amphoteric
Specific heat capacity:.14 Jg(x.1) K(x.1) at 300Deg. Kelvin
Thermal conductivity:.23 W cm(x.1) K(x.1) at 300Deg. Kelvin
Description:A metallic element resembling zirconium chemically,occuring in
zirconium minerals,and being useful because of it's ready emission of electrons.

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