Barium
Chemical, physical and material properties and data of the chemical element Barium.
General Information about Barium
Regular nameBariumChemical symbolBaOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership
Atomar Properties of Barium
Atomic number Z56 = number of protonsStandard Atomic Weight137.327 (7)
Electron configuration of Barium
| 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 | | 2 | 6 | | | 2 | | | | | |
Abbreviated form: [Xe] 6s2 .
Ionization Energies of Barium
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 Barium atom.
| IE1 | IE2 | IE3 | IE4 | IE5 | IE6 | IE7 | IE8 |
|---|
| 5.211664 | 10.00383 | 35.844 | 47.03 | 58 | 71 | 86 | 101 |
Isotopic Data of Barium
An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Barium isotopes.
Chemistry of Barium
Oxidation states+ 2Electronegativity0.9 (Pauling original)
0.89 (Pauling)
0.881 (Allen)
0.93 (Sanderson)
0.97 (Allred-Rochow)
2.4 eV (Pearson)Electron affinity0.144 62(6) eV
13.954(6) kJ mol-1
Standard Electrode Potential
| E0 (V) | Symbol | Nox | Name Ox.
Name Red. | Ox.
Red. | e- |
|---|
| -2.912 | Ba | + II
0 | Barium cation
Barium | Ba2+
⇄ Ba (s) | + 2 e- |
Material and Physical Properties
Melting point727 °CEnthalpy of fusion (molar)7.12 kJ mol-1Boiling point1845 °CEnthalpy of vaporization150.9 kJ mol-1Density3.51 g cm-3
External Data, Identifiers
CAS registry number7440-39-3InChI =1S/BaInChIKeyDSAJWYNOEDNPEQ-UHFFFAOYSA-NPubChem ID5355457
Last update: 2022-12-12
Perma link: https://www.chemlin.org/chemical-elements/barium.php
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