Francium
Chemical, physical and material properties and data of the chemical element Francium.
General Information about Francium
Regular nameFranciumChemical symbolFrOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership
Atomar Properties of Francium
Atomic number Z87 = number of protonsStandard Atomic Weight223.019736138
Electron configuration of Francium
| 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 | | 2 | 6 | | | 1 | |
Abbreviated form: [Rn] 7s1 .
Ionization Energies of Francium
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 Francium atom.
Isotopic Data of Francium
An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Francium isotopes.
Chemistry of Francium
Oxidation states+ 1Electronegativity0.7 (Pauling original)
0.70 (Pauling)Electron affinity0.486 eV
46.89 kJ mol-1
Material and Physical Properties
Melting point21 °CEnthalpy of fusion (molar)~ 2 kJ mol-1Boiling point620 °CEnthalpy of vaporizationca. 65 kJ mol-1Density2.84 g cm-3
External Data, Identifiers
CAS registry number7440-73-5InChI =1S/FrInChIKeyKLMCZVJOEAUDNE-UHFFFAOYSA-NPubChem ID6328145
Last update: 2022-12-12
Perma link: https://www.chemlin.org/chemical-elements/francium.php
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