Calcium

 CALCIUM (20) (Solid)  45(165 days)B-  56(78.8 days)B+,EC  57(270 days)EC

 58(71.3 days)B+,EC  60(5.272 years)B-

Atomic radius:1.74Deg. A (Quantum mech. value for a free atom)

Atomic volume:29.9 cm(3)/mol at 300Deg. Kelvin

Atomic weight:40.08 (Based on Carbon 12)

Boiling point:1757Deg. Kelvin

Covalent radius:1.74Deg. A

Crystal structure:Cubic,face centered

Density:1.55 g/cm(3) at 300Deg. Kelvin

Electrical conductivity:.298 10(x6) Ohm(x.1) K(x.1) at 293Deg. Kelvin

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

Electronegativity:1 (Pauling's)

First ionization potential:6.113 V

Heat of fusion:8.53 kJ/mol at melting point

Heat of vaporization:153.6 kJ/mol at boiling point

Melting point:1112Deg. Kelvin

Oxidation states:2,very basic

Specific heat capacity:.63 Jg(x.1) K(x.1) at 300Deg. Kelvin

Thermal conductivity:2.0 W cm(x.1) K(x.1) at 300Deg. Kelvin

Description:A silver-white,bivalent metallic element of the alkaline earth

group and occurs only in combination.

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