Cobalt Element (Periodic Table)

Cobalt

Cobalt (Co) is a chemical element of the periodic table, located in the group 9 and the period 4, and is having the atomic number 27. It is a hard, lustrous, silvery-grey transition metal, whose name comes from the German word “kobald”, which means goblin.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
1
H
2
He
2
3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
3
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
4
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
5
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
6
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
7
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
– d block

FAQs on Cobalt Element

Cobalt
‣ What does cobalt look like?

Appearance: hard lustrous bluish gray metal
‣ When was cobalt discovered and by whom?

Discovery and first isolation: Georg Brandt (1735)
‣ Where is cobalt located on the periodic table?

Cobalt Periodic Table

Location: Cobalt is found in the ninth column of the periodic table, next to the iron element.
‣ What is the atomic number of cobalt?

Atomic number (Z): 27
‣ What’s the symbol for cobalt?

Symbol: Co
‣ What is the atomic weight of cobalt?

Standard atomic weight: 58.933194
‣ What block does cobalt belong to?

Block: d-block
‣ What group is cobalt in on the periodic table?

Group: 9
‣ What period is cobalt in on the periodic table?

Period: 4
‣ What is the atomic radius of cobalt?

Atomic radius: empirical: 125 pm
Cobalt covalent radius:
Low spin: 126±3 pm
High spin: 150±7 pm
‣ What is the melting point of cobalt?

Melting point: 1768 K (1495 °C, 2723 °F)
‣ What is the boiling point of cobalt?

Boiling point: 3200 K (2927 °C, 5301 °F)
‣ How many electron shells does cobalt have?

Electrons per shell: 2, 8, 15, 2
‣ What is cobalt’s electron configuration?

Electron configuration: [Ar] 3d7 4s2
‣ What is the ionization energy of cobalt?

Ionization energies:
1st: 760.4 kJ/mol
2nd: 1648 kJ/mol
3rd: 3232 kJ/mol
‣ What is the phase of cobalt?

Phase (at r.t): solid
‣ What is the density of cobalt?

Density (near r.t): 8.90 g/cm3
when liquid (at m.p): 8.86 g/cm3
Cobalt magnetic ordering: ferromagnetic
Cobalt natural occurrence: primordial
‣ What is the cobalt oxidation state?

Oxidation state: +2, +3
‣ What’s the electronegativity of cobalt?

Electronegativity: Pauling scale: 1.88
Cobalt poisson’s ratio: 0.31
Cobalt heat of fusion: 16.06 kJ/mol
Cobalt heat of vaporization: 377 kJ/mol
Cobalt molar heat capacity: 24.81 J/(mol K)
Speed of sound in cobalt: 4720 m/s (at 20 °C)
‣ What is the crystal structure of cobalt?

Crystal structure: hexagonal close-packed (hcp)
Thermal expansion of cobalt: 13.0 µm/(m.K) (at 25 °C)
Thermal conductivity of cobalt: 100 W/(m.K)
Cobalt electrical resistivity: 62.4 nΩ.m (at 20 °C)
‣ What is the hardness of cobalt?

Mohs hardness: 5.0
Brinell hardness: 1043 MPa
Young’s modulus of cobalt: 209 GPa
Shear modulus of cobalt: 75 GPa
Bulk modulus of cobalt: 180 GPa
Cobalt CAS number: 7440-48-4

‣ Cobalt vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)179019602165242327553198

‣ How many isotopes does cobalt have?

Main isotopes of cobalt
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
56Cosyn77.27 dε56Fe
57Cosyn271.74 dε57Fe
58Cosyn70.86 dε58Fe
59Co100 %stable
60Cosyn5.3714 yβ, γ60Ni

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