Co - Cobalt

A transition metal, discovered by Brandt in 1735. We use cobalt chloride for its striking color change upon dehydration.

Atomic number - 27 Density g/mL 8 .9

Atomic weight u 58 .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: Click mass number for decay process, product for element page.

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	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	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	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	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	070 200 nsec B-,12.700 MeV Ni-70 69.949758
071 0.20 sec B-,10.900 MeV Ni-71 70.951690	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass

Atomic number	-	27		Density	g/mL	8	.9
Atomic weight	u	58	.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