Cobalt

Chemical, physical and material properties and data of the chemical element Cobalt.

Content

General data

Atomar properties

Electron configutation

General Information about Cobalt

Regular nameCobaltChemical symbolCoOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Cobalt

Atomic number Z27 = number of protonsStandard Atomic Weight58.933194 (3)

Electron configuration of Cobalt

1s	2s	2p	3s	3p	3d	4s	4p	4d	4f	5s	5p	5d	5f	6s	6p	6d	6f	7s	7p
2	2	6	2	6	7	2

Abbreviated form: [Ar] 3d⁷ 4s² .

Ionization Energies of Cobalt

The following table lists the ionization energies IE (ionization potentials); the IE is the energy required in electron volts (eV) per atom to separate a given electron from an Cobalt atom.

IE1	IE2	IE3	IE4	IE5	IE6	IE7	IE8
7.88101	17.084	33.50	51.3	79.5	102.0	128.9	157.8

Isotopic Data of Cobalt

An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Cobalt isotopes.

Chemistry of Cobalt

Oxidation states+2. +3Electronegativity1.8 (Pauling original)
1.88 (Pauling)
1.84 (Allen)
3.7305 eV (Gosh Gupta)
4.3 eV (Pearson)Electron affinity0.662 26(5) eV
63.898(5) kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-0.28	Co	+ II 0	Cobalt(II) cation Cobalt	Co²⁺ ⇄ Co (s)	+ 2 e^-
1.42	Co	+ IV + III	Cobalt(IV)-oxid Cobalt(III) cation	CoO₂ (s) + 4 H⁺ ⇄ Co³⁺ + 2 H₂O	+ e^-
1.82	Co	+ III + II	Cobalt(III) cation Cobalt(II) cation	Co³⁺ ⇄ Co²⁺	+ e^-

Material and Physical Properties

Melting point1495 °CEnthalpy of fusion (molar)16.06 kJ mol^-1Boiling point2927 °CEnthalpy of vaporization382.4 kJ mol^-1Density8.90 g cm^-3

External Data, Identifiers

CAS registry number7440-48-4InChI =1S/CoInChIKeyGUTLYIVDDKVIGB-UHFFFAOYSA-NPubChem ID104730

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Last update: 2022-12-12

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