Beryllium (Be)
Beryllium
Beryllium (Be) is an alkaline earth metal in period 2, group 2. Its relative atomic mass is 9.0122 and the molar mass of the atom is 9.012 g/mol.
Atomic number 4
Atomic mass 9.0122
Molar mass 9.012 g/mol
Category Alkaline earth metal Solid
Properties of beryllium
| Atomic number | 4 |
|---|---|
| Symbol | Be |
| Latin name | Beryllium |
| Relative atomic mass | 9.0122 |
| Molar mass | 9.012 g/mol |
| Group, period, block | 2, 2, s |
| Category | Alkaline earth metal |
| State at 20 °C | Solid |
| Electron configuration | [He] 2s² |
| Electronegativity (Pauling) | 1.57 |
| Atomic radius | 105 pm |
Electron configuration of beryllium
Electrons per shell
K2L2
Full notation
1s² 2s²
Noble-gas notation
4 protons · 4 electrons[He] 2s²
Formula and compounds of beryllium
Simple substanceBeberylliumMolar mass of Be: 9.012 g/mol
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Frequently asked questions
The relative atomic mass of beryllium is 9.0122, so the molar mass of the atom is 9.012 g/mol.
Full: 1s² 2s². Noble-gas notation: [He] 2s².