| Property | Value |
|---|---|
| Atomic number | 12 |
| Atomic weight | 24.30506 amu |
| Element family | Alkali earth metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 24Mg: 78.99%, 25Mg: 10.00%, 26Mg: 11.01% |
| Previous element | Sodium |
| Next element | Aluminum |
| Density | 1.738 g/cm3 (STP) |
| Melting | 650 °C |
| Boiling | 1107 °C |
| Covalent radius | 1.39 Å |
| Van der Waals radius | 1.73 Å |
| Ionic radius | 0.72 Å |
| Metallic radius | 1.6 Å |
| First ionization potential | 7.646 eV |
| Electron affinity | -0.400 eV |
| Electronegativity | 1.31 |
| Discovery year | 1755 |
Magnesium is an element number 12 from alkali earth metals family. Its symbol is Mg. Magnesium atomic weight is 24.30506 amu. Mg stable and long lived isotopes are 24Mg: 78.99%, 25Mg: 10.00%, 26Mg: 11.01%. Magnesium electronic configuration is 1s22s22p63s2. Sample compounds that contain Magnesium are MgCl2, MgSO4, Mg(OH)2, MgO, Mg(NO3)2, Mg3(PO4)2.
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