Radium

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

Contents

General Information about Radium

Regular nameRadiumChemical symbolRaOther namesHistorical 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

Shorthand electron configuration of Radium: [Rn] 7s² .

Ionization Energies of Radium

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 Radium atom.

IE1	IE2
5.278423	10.14715

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	N_ox	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

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isotopes

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Last update: 2022-12-12

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