Americium
Chemical, physical and material properties and data of the chemical element Americium.
General Information about Americium
Regular nameAmericiumChemical symbolAmOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership
Atomar Properties of Americium
Atomic number Z95 = number of protonsStandard Atomic Weight243.061382541
Electron configuration of Americium
| 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 | 10 | 7 | 2 | 6 | | | 2 | |
Abbreviated form: [Rn] 5f7 7s2 .
Ionization Energies of Americium
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 Americium atom.
Isotopic Data of Americium
An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Americium isotopes.
Chemistry of Americium
Oxidation states+ 3Electronegativity1.3 (Pauling original)
1.30 (Pauling)Electron affinity0.1 eV
9.93 kJ mol-1
Material and Physical Properties
Melting point1176Enthalpy of fusion (molar)14.39 kJ mol-1Boiling point2607 °CEnthalpy of vaporization238.5 kJ mol-1Density12 g cm-3
External Data, Identifiers
CAS registry number7440-35-9InChI =1S/AmInChIKeyLXQXZNRPTYVCNG-UHFFFAOYSA-NPubChem ID23966
Last update: 2022-12-12
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