Radium
Chemical, physical and material properties and data of the chemical element Radium.
General Information about Radium
Regular nameRadiumChemical symbolRaOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership
Atomar Properties of Radium
Atomic number Z88 = number of protonsStandard Atomic Weight226.025409353
Electron configuration of Radium
| 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 | | | 2 | |
Abbreviated form: [Rn] 7s2 .
Ionization Energies of Radium
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 Radium atom.
Isotopic Data of Radium
An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Radium isotopes.
Chemistry of Radium
Oxidation states+ 2Electronegativity0.9 (Pauling original)
0.90 (Pauling)Electron affinity0.1 eV
9.6485 kJ mol-1
Standard Electrode Potential
| E0 (V) | Symbol | Nox | Name Ox.
Name Red. | Ox.
Red. | e- |
|---|
| -2.8 | Ra | + II
0 | Radium cation
Radium | Ra2+
⇄ Ra (s) | + 2 e- |
Material and Physical Properties
Melting point696 °CEnthalpy of fusion (molar)8.5 kJ mol-1Boiling point1737 °CEnthalpy of vaporization136.8 kJ mol-1Density5.5 g cm-3
External Data, Identifiers
CAS registry number7440-14-4InChI =1S/RaInChIKeyHCWPIIXVSYCSAN-UHFFFAOYSA-NPubChem ID6328144
Last update: 2022-12-12
Perma link: https://www.chemlin.org/chemical-elements/radium.php
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