Ca - Calcium - periodic table of the elements

Although compounds of the alkaline earth metal have been used since the days of the pharaoh, pure calcium metal was not obtained until Humphrey Davy electrolyzed it from a salt in 1808. Calcium is critical in the human diet for strong bones and teeth.

Atomic number	20		Density, g/mL	1	.55
Atomic weight,u	40	.08	Melting point, K	1112
Bonding radius, A	1	.74	Boiling point, K	1757
Atomic radius, A	2	.23	Heat of vaporization, kJ/mol	153	.6
Ionization Potential, V	6	.113	Heat of fusion, kJ/mol	8	.54
Electronegativity	1	.	Specific heat, J/gK	0	.63
The oxide is a strong base.			Crystal are face centered cubic.
Electron configuration: [Ar] 4s²

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 114

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr