Co - Cobalt

A transition metal, discovered by Brandt in 1735. We use cobalt chloride for its striking color change upon dehydration. Some of our students may observe the 423 nm emission line with an emission spectroscope.

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

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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 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

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

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
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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