Osmium
Chemical, physical and material properties and data of the chemical element Osmium.
General Information about Osmium
Regular nameOsmiumChemical symbolOsOther namesSystematic nameHistorical 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 | | | | | |
Abbreviated form: [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 volts (eV) per atom to separate a given electron from an Osmium atom.
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
Last update: 2022-11-25
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