Mendeleev's Periodic Table > Co - Cobalt

Co - Cobalt

Cobalt is a brittle, hard, transition metal with magnetic properties similar to those of iron, discovered by Brandt in 1735. Cobalt is present in meteorites. Ore deposits are found in Zaire, Morocco and Canada. Cobalt-60 (60Co) is an artificially produced isotope used as a source of gamma rays (high energy radiation). Cobalt salts colour glass a beautiful deep blue colour.

Atomic number - 27 Density g/mL 8 .9
Atomic weight u 58 align="left".9332 Melting point K 1768
Bonding radius A 1 .16 Boiling point K 3201
Atomic radius A 1 .67 Heat of vaporization kJ/mol 376 .5
Ionization Potential V 7 .86 Heat of fusion kJ/mol 16 .19
Electronegativity - 1 .88 Specific heat J/gK 0 .42
The oxide is amphoteric. Crystal are hexagonal.
Electron config. : [Ar] 3d7 4s2

Isotopes of Co (Cobalt):

MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 052

EC/ECp,14.010
Fe-52/Mn-51
51.963155 		053
240 msec
EC/p,8.302
Fe-53/Fe-52
52.954225 		054
193.23 msec
EC,8.243 MeV
Fe-54
53.948464 		054a
1.48 min
EC,8.442 MeV
Fe-54
53.948677
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 055
17.53 hr
EC,3.451 MeV
Fe-55
54.942003 		056
77.27 da
EC,4.566 MeV
Fe-56
55.939843 		057
271.79 da
EC,2.691 MeV
Fe-57
56.936295 		058
70.82 da
EC,2.307 MeV
Fe-58
57.935757
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 059 100%

Stable

58.933199 		060
1925.1 da
B-,2.824 MeV
Ni-60
59.933821 		060a
10.467 min
B-,2.883 MeV
Ni-60
59.933885 		061
1.650 hr
B-,1.322 MeV
Ni-61
60.932479
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 062
1.50 min
B-,5.315 MeV
Ni-62
61.934054 		063
27.4 sec
B-,3.672 MeV
Ni-63
62.933615 		064
0.30 sec
B-,7.307 MeV
Ni-64
63.935813 		065
1.20 sec
B-,5.958 MeV
Ni-65
64.936483
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 066
0.23 sec
B-,10.000 MeV
Ni-66
65.939774 		067
0.42 sec
B-,8.400 MeV
Ni-67
66.940633 		068
0.18 sec
B-,11.700 MeV
Ni-68
67.944390 		069
0.27 sec
B-,9.300 MeV
Ni-69
68.945249
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 070
200 nsec
B-,12.700 MeV
Ni-70
69.949758 		071
0.20 sec
B-,10.900 MeV
Ni-71
70.951690