27 Co Cobalt 58.933 u

Cobalt

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Period
4
Group
9
Block
d-block
Phase (STP)
Solid

Cobalt is a hard, lustrous transition metal used in superalloys and blue pigments. It is a key component of lithium-ion batteries and vitamin B12.

Appearance: Hard, lustrous, bluish-gray

About Cobalt

Long prized for the deep blue it gives to glass and ceramics, cobalt is a hard, lustrous, bluish-gray transition metal of atomic number 27 and atomic mass 58.933. It has a density of 8.9 g/cm³ and a melting point of 1768 K. Its [Ar] 3d7 4s2 configuration gives an electronegativity of 1.88 and a first ionization energy of 760 kJ/mol. Georg Brandt first isolated the metal in 1735. Cobalt is used in heat-resistant superalloys and blue pigments, and it is a key component of lithium-ion batteries and of vitamin B12. The element belongs to group 9, period 4.

Physical Properties

Atomic Mass 58.933 u
Density 8.9 g/cm³
Melting Point 1494.8 °C
Boiling Point 2926.8 °C
Phase at STP Solid
Atomic Radius 152.0 pm

Electronic Properties

Electronegativity 1.88
Ionization Energy 760.4 eV
Electron Affinity 63.7 eV
Valence Electrons 9

Electron Configuration

Configuration [Ar] 3d⁷ 4s²

Electron Shell Configuration

Cobalt electron shell configuration Co 2e⁻ 8e⁻ 15e⁻ 2e⁻
Electron shell structure of Cobalt — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 15
4 (N) 2

Position in Periodic Table

Cobalt position in the periodic table Co

Discovery

Discovered by: Georg Brandt
Year: 1735

Block & Period

Block

s p d f

Period

1 2 3 4 5 6 7

Periodic Table

Lanthanides Actinides

Reactions Involving Co

Beta Decay of Cobalt-60

⁶⁰Co → ⁶⁰Ni + e⁻ + ν̄ₑ + γ

Nuclear

Compounds Containing Cobalt

Cobalt(II) Chloride

CoCl₂

Cobalt(II) Oxide

CoO

Lithium Cobalt Oxide

LiCoO₂

Lithium Nickel Manganese Cobalt Oxide

LiNi₀.₃₃Mn₀.₃₃Co₀.₃₃O₂

Samarium Cobalt

SmCo₅

More Transition Metal

21 Sc Scandium 22 Ti Titanium 23 V Vanadium 24 Cr Chromium 25 Mn Manganese 26 Fe Iron 28 Ni Nickel 29 Cu Copper 30 Zn Zinc 39 Y Yttrium

Frequently Asked Questions

What is Cobalt?
Cobalt (Co) is a chemical element with atomic number 27. It is a solid at standard temperature and pressure, classified as a transition metal.
What are the key properties of Cobalt?
Cobalt has an atomic mass of 58.933 u, density of 8.9 g/cm³, melting point of 1494.8°C, boiling point of 2926.8°C.
What is the electron configuration of Cobalt?
The electron configuration of Cobalt is [Ar] 3d7 4s2. It is in the d-block of the periodic table.
Who discovered Cobalt?
Cobalt was discovered by Georg Brandt in 1735.
What is the electronegativity of Cobalt?
Cobalt has an electronegativity of 1.88 on the Pauling scale.