Beryllium
Chemical, physical and material properties and data of the chemical element Beryllium.
General Information about Beryllium
Regular nameBerylliumChemical symbolBeOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership
Atomar Properties of Beryllium
Atomic number Z4 = number of protonsStandard Atomic Weight9.0121831 (5)
Electron configuration of Beryllium
| 1s | 2s | 2p | 3s | 3p | 3d | 4s | 4p | 4d | 4f | 5s | 5p | 5d | 5f | 6s | 6p | 6d | 6f | 7s | 7p |
|---|
| 2 | 2 | | | | | | | | | | | | | | | | | | |
Abbreviated form: [He] 2s2 .
Ionization Energies of Beryllium
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 Beryllium atom.
| IE1 | IE2 | IE3 | IE4 |
|---|
| 9.32270 | 18.21114 | 153.89661 | 217.71865 |
Isotopic Data of Beryllium
An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Beryllium isotopes.
Chemistry of Beryllium
Oxidation states+ 2Electronegativity1.5 (Pauling original)
1.57 (Pauling)
1.576 (Allen)
1.61 (Sanderson)
1.47 (Allred-Rochow)
3.7060 eV (Gosh Gupta)
4.9 eV (Pearson)Electron affinity-0.5(2) eV
-48(20) kJ mol-1
Standard Electrode Potential
| E0 (V) | Symbol | Nox | Name Ox.
Name Red. | Ox.
Red. | e- |
|---|
| -1.85 | Be | + II
0 | Beryllium(II) cation
Beryllium | Be2+
⇄ Be (s) | + 2 e- |
Material and Physical Properties
Melting point1287 °CEnthalpy of fusion (molar)7.895 kJ mol-1Boiling point2469 °CEnthalpy of vaporization308.8 kJ mol-1Density1.85 g cm-3
External Data, Identifiers
CAS registry number7440-41-7InChI =1S/BePubChem ID5460467
Last update: 2022-12-12
Perma link: https://www.chemlin.org/chemical-elements/beryllium.php
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