Elements
27

Co

Cobalt

Cobalt (Co) is a bluish-white metal that has the atomic number 27 in the periodic table. It is a Transition metal and located in Group 9 of the periodic table. It has the symbol Co.

Cobalt is a transition metal first isolated by Swedish chemist George Brandt in 1735. Previously it has been used for centuries as a blue glaze for pottery. Persian’s used cobalt blue dating back to the 3rd millenium BC. The name cobalt is derived from the German ‘kobalt’ which means goblin used by the miners who found Cobalt ores. Georg Brandt found that cobalt was the blue colour in glass which had previously been identified as Bismuth. Cobalt is widely used in aircraft parts and alloys to prevent corrosion. It is also used in the production of batteries. The radioactive Cobalt-60 is used in the treatment of cancer. Cobalt is not found as a free element in nature it is found in mineral ores, most commonly those identified by the Assyrians who used them in painting. It is located in Group 9 and it has a melting point of 1495°c and a boiling point of 2927°c being a solid metal at room temperature.

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FAQ's

What is the Melting Point for Cobalt?

Cobalt has a Melting Point of 1495°F, meaning at 1495°F it will turn to a liquid.

What is the Boiling Point for Cobalt?

Cobalt has a Boiling Point of 2927°F, meaning at 2927°F it will turn to a Gas.

What is the Electronegativity of Cobalt?

Cobalt's Electronegativty is 1.88. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Cobalt?

Cobalt has a Heat of Vaporization of 376.5 kJ/mol.

Uses

Used in many hard alloys; for magnets, ceramics and special glasses. Remains hard up to 982°C. Radioactive cobalt-60 is used in cancer therapy.

Sources

Occurs in compounds with arsenic, oxygen and sulfur as in cobaltine (CoAsS) and linneite (Co3S4). Pure cobalt is obtained as a byproduct of refining nickel, copper and iron.

27
Protons
27
Electrons
32
Neutrons

Co

Element Symbol
Co
Atomic Weight
58.933
Atomic Number
27
State
Solid
Melting Point
Unknown
1495
°C
Boiling Point
2927
Unknown
°C
Heat of Vaporization
376.5
Unknown
kJ/mol
Crystal Structure
Hexagonal
Thermoconductivity
1
Unknown
W/cmK
Shells
2,8,15,2
Group
Transition Metal
Period
4
Block
D Block
Orbitals
[Ar] 3d7 4s2
Coefficient of Thermal Expansion
13 10^-6 K^-1
Covalent Radius
1.16 Å
Density at 293K
8.90 g/cm³
Electrical Conductivity
0.172 10^6/cm ohm
First Ionization Potential
7.8810 V
Second Ionization Potential
17.06 V
Third Ionization Potential
33.50 V
Ionic Radius
.65 (+2) Å
Oxydation States
(2),3
Lattice Parameter
2.507 Å
Lattice Parameter 2
--
Lattice Parameter 3
4.9470 Å
Pronounced

KO-bolt

Discovered by

George Brandt

Discovery date

1739

Orbital configuration
2,8,15,2

Download the Periodic Table

Explore Other Transition Metals

65.38
30

Zn

Zinc
183.84
74

W

Tungsten
97
43

Tc

Technetium
270
105

Db

Dubnium
267
104

Rf

Rutherfordium
101.07
44

Ru

Ruthenium
192.217
77

Ir

Iridium
44.956
21

Sc

Scandium
107.868
47

Ag

Silver
270
107

Bh

Bohrium
178.49
72

Hf

Hafnium
63.546
29

Cu

Copper
102.905
45

Rh

Rhodium
285
112

Cn

Copernicium
186.207
75

Re

Rhenium
269
106

Sg

Seaborgium
195.084
78

Pt

Platinum
88.906
39

Y

Yttrium
95.95
42

Mo

Molybdenum
51.996
24

Cr

Chromium
92.906
41

Nb

Niobium
50.942
23

V

Vanadium
112.414
48

Cd

Cadmium
106.42
46

Pd

Palladium
54.938
25

Mn

Manganese
200.592
80

Hg

Mercury
58.693
28

Ni

Nickel
270
108

Hs

Hassium
180.948
73

Ta

Tantalum
190.23
76

Os

Osmium
47.867
22

Ti

Titanium
196.967
79

Au

Gold
91.224
40

Zr

Zirconium
55.845
26

Fe

Iron
Transition metal is any of various chemical elements that have valence electrons (electrons that can participate in the formation of chemical bond) in two shells instead of only one. They form group 3 (IIIb) through group 12 (IIb).
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