Osmium

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

Contents

General Information about Osmium

Regular nameOsmiumChemical symbolOsOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Osmium

Atomic number Z76 = number of protonsStandard Atomic Weight190.23 (3)

Electron configuration of Osmium

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	10	2	6	10	14	2	6	6		2

Shorthand electron configuration of Osmium: [Xe] 4f¹⁴ 5d⁶ 6s² .

Ionization Energies of Osmium

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

IE1
8.43823

Isotopic Data of Osmium

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

Chemistry of Osmium

Oxidation states+4Electronegativity2.2 (Pauling original)
2.20 (Pauling)
1.65 (Allen)
4.9 eV (Pearson)Electron affinity1.077 80(13) eV
103.99(2) kJ mol^-1

Material and Physical Properties

Melting point3033 °CEnthalpy of fusion (molar)31.8 kJ mol^-1Boiling point5008 °CEnthalpy of vaporization627.6 kJ mol^-1Density22.59 g cm^-3

External Data, Identifiers

CAS registry number7440-04-2InChI =1S/OsInChIKeySYQBFIAQOQZEGI-UHFFFAOYSA-NPubChem ID23937

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isotopes

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Last update: 2022-11-25

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