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Cobalt
Cobalt
Identification
Symbol
Co
Block
d-Block
Group
9
Period
4th
Atomic Information
Atomic Number
27
Atomic Radius
135 pm
Mass
58.93 u
Category
Standard state(298 K)
Solid
Electronic Configuration
[Ar] 3d7 4s2
Electronegativity (Pauling)
1.88
63.7 kJmol-1
First ionisation energy
760.4 kJ mol-1
Physical Properties
Color
Bluish-white
Melting Point
1768 K
Boiling Point
3200 K
Density of solid
8900 kg m-3
67%
Heat Properties
Enthalpy of fusion
203 kJ mol-1
Enthalpy of atomisation
426 kJ mol-1
Enthalpy of vaporisation
375 kJ mol-1


Cobalt is the 27th element in the periodic table. It is a brittle, hard, silver-grey transition metal with magnetic properties similar to those of iron i.e. it is ferromagnetic. Cobalt is present in meteorites. It has a density of 8.9 gcm-3. Cobalt is also found  in earth's crust in combined state. 

Cobalt salts colour glass a beautiful deep blue colour. Cobalt compounds are important catalysts in a number of industrial processes. Cobalt's abundance in Earth's crust is 0.003%. Ore deposits of cobalt are found in Zaire, Zambia, Morocco and Canada.

Biological Significance

Cobalt is required in small amounts for life and is the only metal found in vitamins (cobalt is the critical component of vitamin B12). In human body, cobalt is present in liver and in some proteins. Cobalt is found in many food products such as, </span>Vitamin B12, clams, dairy products, kidney, liver, meats, oysters, some seaweed. Cobalt helps in protein formation and DNA regulation. 

1
H
2
He
3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
55
Cs
56
Ba
* 72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
87
Fr
88
Ra
** 104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Nh
114
Fl
115
Mc
116
Lv
117
Ts
118
Og


* 57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
** 89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr

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