Ca - Calcium

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. 

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 config. : [Ar] 4s2


Isotopes of Ca: Click mass number for decay process, product for element page.


035
50 msec
EC/EC2p,15.610
K-35/Cl-33
35.004766
036
102 msec
EC/ECp,10.990
K-36/Ar-35
35.993086
037
181.1 msec
EC/ECp,11.639
K-37/Ar-36
36.985871
038
440 msec
EC,6.743 MeV
K-38
37.976318
039
859.6 msec
EC,6.531 MeV
K-39
38.970717
040 96.941%

Stable

39.962591
041
1.03E+5 yr
EC,11.140 MeV
K-41
40.962278
042 0.647%

Stable

41.958618
043 0.135%

Stable

42.958766
044 2.086%

Stable

43.955481
045
162.61 da
B-,4.204 MeV
Sc-45
44.956185
046 0.004%

Stable

45.953692
047
4.536 da
B-,1.992 MeV
Sc-47
46.954546
048 0.187%
6E+18 yr
2B-,4.272 MeV
Ti-48
47.952533
049
8.718 min
B-,5.262 MeV
Sc-49
48.955673
050
13.9 sec
B-,4.966 MeV
Sc-50
49.957518
051
10.0 sec
B-/B-n,7.310
Sc-51/Sc-50
50.961459
052
4.6 sec
B-,7.900 MeV
Sc-52
51.965109
053
90 msec
B-/B-n,10.100
Sc-53/Sc-52
52.970048
054

B-,10.900 MeV
Sc-54
53.974664
MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass