Cobalt (Co) in the periodic table — PeriodicTable

Cobalt (Co) in the periodic tableCobalt is element 27, a transition metal of the d block, in group 9, period 4. Its ground-state configuration is [Ar] 3d7 4s2, and it usually shows the oxidation states 0, 2, 3.It was discovered in 1735, by Brandt.Name origin: the German word Kobold, 'goblin'. Blank rows are columns the sheet does not measure for this element.

Property

Value

Unit

Atomic weight

58.933195

Da

Electronegativity

1.88

First ionisation energy

760.4

kJ/mol

Covalent radius

126

pm

Melting point

1768

K

Boiling point

3200

K

Density

8.86

g/cm³

Abundance

25

mg/kg

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