Rubidium

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

Contents

General Information about Rubidium

Regular nameRubidiumChemical symbolRbOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Rubidium

Atomic number Z37 = number of protonsStandard Atomic Weight85.4678 (3)

Electron configuration of Rubidium

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			1

Shorthand electron configuration of Rubidium: [Kr] 5s¹ .

Ionization Energies of Rubidium

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 Rubidium atom.

IE1	IE2	IE3	IE4	IE5	IE6	IE7	IE8
4.177128	27.2898	39.0	52.2	68.5	82.4	97.43	132.79

Isotopic Data of Rubidium

An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Rubidium isotopes.

Chemistry of Rubidium

Oxidation states+1Electronegativity0.8 (Pauling original)
0.82 (Pauling)
0.706 (Allen)
1.0 (Mulliken)
0.70 (Sanderson)
0.89 (Allred-Rochow)
2.0135 eV (Gosh Gupta)
2.34 eV (Pearson)Electron affinity0.485 916(21) eV
46.884(3) kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-2.98	Rb	+ I 0	Rubidium cation Rubidium	Rb⁺ ⇄ Rb (s)	+ e^-

Material and Physical Properties

Melting point39.30 °CEnthalpy of fusion (molar)2.19 kJ mol^-1Boiling point688 °CEnthalpy of vaporization69.2 kJ mol^-1Density1.532 g cm^-3 (20 °C)

External Data, Identifiers

CAS registry number7440-17-7InChI =1S/RbInChIKeyIGLNJRXAVVLDKE-UHFFFAOYSA-NPubChem ID5357696

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isotopes

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Last update: 2022-12-12

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