Rubidium
Chemical, physical and material properties and data of the chemical element Rubidium.
General Information about Rubidium
Regular nameRubidiumChemical symbolRbOther namesSystematic nameHistorical 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 | | | | | | | | | |
Abbreviated form: [Kr] 5s1 .
Ionization Energies of Rubidium
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 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 | Nox | 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
Last update: 2022-12-12
Perma link: https://www.chemlin.org/chemical-elements/rubidium.php
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