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12
Mg
24.305
Magnesium
Alkaline earth metals · Group 2 · Period 3
Atomic properties
| Atomic number | 12 |
|---|---|
| Symbol | Mg |
| Standard atomic weight | 24.305 |
| Classification | Alkaline earth metals |
| Group | 2 |
| Period | 3 |
| Block | s-block |
| Electron configuration | [Ne] 3s2 |
| Electronegativity (Pauling) | 1.31 |
| Common oxidation states | +2 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 1.738 g/cm³ |
| Melting point | 650 °C |
| Boiling point | 1090 °C |
| Discovered | 1755 |
| CAS number | — |