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Magnesium (Mg)
Atomic number 12 · alkaline
| Atomic number | 12 |
|---|---|
| Atomic mass | 24.305 u |
| Molar mass | 24.305 g/mol |
| Category | alkaline |
| Group / period / block | 2 / 3 / s |
| Electron configuration | [Ne] 3s2 |
| Electrons per shell | 2, 8, 2 |
| Electronegativity (Pauling) | 1.31 |
| Atomic radius | 150.0 pm |
| Density | 1.74 g/cm³ |
| First ionisation energy | 7.6462 eV |
| Melting point | 923.15 K (650.00 °C) |
| Boiling point | 1363.15 K (1090.00 °C) |
| Common oxidation states | +2 |
| Abundance in Earth's crust | 23300 ppm |
Uses
Light alloys, fireworks, antacids
Discovery
1808, Sir Humphrey Davy