Symbol	Ca	Atomic radius: pm	197	Fusion: kJ/Mole	8.54
Name	Calcium	Ionic radius: pm	(+2)100	Boiling point: °C	1484
Atomic number	20	Electron affinity	0.04	Melting point: °C	842
Atomic weight	40.08	1st  ion potential	6.11	Specific Heat Cap: J/(g K)	0.65
Classification	Alk earth metal	Natural form	Solid	Thermal Cond: W/(cm K)	2.01
Configuration	[Ar]4s2	Crystal structure	FCC	Electrical Cond	0.298
Oxidation states	2	Density	1.54	Abundance: mg/kg-crust	41,500
Electronegativity	1.00	Vaporization: kJ/Mole	150.0
Although calcium was extensively used by the ancients as the compound lime, the metal itself was first isolated in 1808 by Sir Humphrey Davy.			Uses - lime, cement, reducing agent for preparation of some metals