Magnesium (Mg)
Magnesium (Mg) is element 12 of the periodic table, an alkaline earth metal in period 3 and group 2. Its standard atomic weight is 24.305, so one mole of magnesium atoms has a mass of 24.305 g. At room temperature it is a solid; it melts at 649.85 °C and boils at 1089.85 °C.
| Atomic number | 12 |
|---|---|
| Symbol | Mg |
| Standard atomic weight | 24.305 |
| Molar mass | 24.305 g/mol |
| Category | Alkaline earth metal |
| Group | 2 |
| Period | 3 |
| Block | s-block |
| Electron configuration | [Ne] 3s2 |
| Oxidation states | +2 |
| Electronegativity (Pauling) | 1.31 |
| Atomic radius (van der Waals) | 173 pm |
| First ionisation energy | 7.646 eV (737.7 kJ/mol) |
| Electron affinity | — |
| State at room temperature | Solid |
| Melting point | 923 K (649.85 °C) |
| Boiling point | 1363 K (1089.85 °C) |
| Density | 1.74 g/cm³ |
| Discovered | 1808 |
Group 2
Calculate with Magnesium
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.