Magnesium (Mg)
Magnesium
Magnesium (Mg) is an alkaline earth metal in period 3, group 2. Its relative atomic mass is 24.305 and the molar mass of the atom is 24.305 g/mol.
Atomic number 12
Atomic mass 24.305
Molar mass 24.305 g/mol
Category Alkaline earth metal Solid
Properties of magnesium
| Atomic number | 12 |
|---|---|
| Symbol | Mg |
| Latin name | Magnesium |
| Relative atomic mass | 24.305 |
| Molar mass | 24.305 g/mol |
| Group, period, block | 2, 3, s |
| Category | Alkaline earth metal |
| State at 20 °C | Solid |
| Electron configuration | [Ne] 3s² |
| Electronegativity (Pauling) | 1.31 |
| Atomic radius | 150 pm |
Electron configuration of magnesium
Electrons per shell
K2L8M2
Full notation
1s² 2s² 2p⁶ 3s²
Noble-gas notation
12 protons · 12 electrons[Ne] 3s²
Formula and compounds of magnesium
Simple substanceMgmagnesiumMolar mass of Mg: 24.305 g/mol
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Frequently asked questions
The relative atomic mass of magnesium is 24.305, so the molar mass of the atom is 24.305 g/mol.
Full: 1s² 2s² 2p⁶ 3s². Noble-gas notation: [Ne] 3s².