12Mg24.305
Magnesium (Mg)
Element 12 Ā· Alkaline earth metal
Magnesium (Mg) is a chemical element with atomic number 12. It is classified as an alkaline earth metal in period 3, group 2 of the periodic table (the s-block). Its standard atomic weight is 24.305 u and its ground-state electron configuration is [Ne] 3sĀ².
Magnesium facts
| Atomic number (Z) | 12 |
|---|---|
| Symbol | Mg |
| Standard atomic weight | 24.305 u |
| Category | Alkaline earth metal |
| Group | 2 |
| Period | 3 |
| Block | s-block |
| Electron configuration | [Ne] 3sĀ² |
| Electronegativity (Pauling) | 1.31 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 12 / 12 |
| Neutrons (most common isotope, approx.) | 12 |
| Molar mass | 24.305 g/mol |