NEPTUNIUM

 NEPTUNIUM (93) (Synthetic) 236(110,000 years)EC,B-  237(2,14,000 years)A

239(2.346 days)B-

Atomic radius:

Atomic volume:11.62 cm(3)/mol at 300Deg. Kelvin

Atomic weight:237.0482 (Based on Carbon 12)

Boiling point:

Covalent radius:

Crystal structure:Orthorhombic

Density:20.4 g/cm(3) at 300Deg. Kelvin

Electrical conductivity:.00822 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(10)p(6)5f(4)6d(1)7s(2)

Electronegativity:1.36 (Pauling's)

First ionization potential:6.19 V

Heat of fusion:5.19 kJ/mol at melting point

Heat of vaporization:

Melting point:910Deg. Kelvin

Oxidation states:6,5,4,3 amphoteric(6)

Specific heat capacity:.12 Jg(x.1) K(x.1) at 300Deg. Kelvin

Thermal conductivity:.063 W cm(x.1) K(x.1) at 300Deg. Kelvin

Description:A radioactive metallic element that is similar chemically to

uranium and is obtained in nuclear reactors as a by-product of plutonium.

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