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. In our laboratories, students use calcium carbonate, chloride and nitrate and react pure calcium with water. We also analyse soil and water for calcium content.

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

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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 110 111 112 113

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

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

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

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
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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