|
|
| Magnesium | |
| Electron Configuration | 2,8,2 |
| Electron Configuration | [Ne] 3s2 |
| Ground state | 1S0 |
| Atomic Volume | 13.97 g/cm3 |
| Electronegativity | 1.31 |
| Magnetic ordering | Paramagnetic |
| Mass magnetic susceptibility | 6.9 x 10-9 |
| Molar magnetic susceptibility | 1.68 x 10-10 |
| Speed of sound | 4940 m s-1 |
 Thermal Properties |
|
| Enthalpy of Atomization | 148.5 kJ mol-1 @25°C |
| Enthalpy of Fusion | 9.04 kJ mol-1 |
| Enthalpy of Vaporisation | 127.6 kJ mol-1 |
| Heat Capacity | 24.869 J mol-1 K-1 |
| Thermal Conductivity | 156 W m-1 K-1 |
| Thermal Expansion | 24.8 μm m-1 K-1 |
| Hardness |
|
| Brinell hardness | 260 MPa |
| Mohs hardness | 2.5 |
| Elastic Properties |
|
| Bulk modulus | 45 GPa |
| Poisson ratio | 0.29 |
| Shear modulus | 17 GPa |
| Young's modulus | 45 GPa |
| Electrical Properties |
|
| Electrical resistivity | 4.4 x 10-7 Ω m |
| Electrical conductivity | No data. |
| Chemical Properties |
|
| Electrochemical Equivalent | 0.45341 g Ah-1 |
| Electron Work Function | 3.66 eV |
| Valence Electron Potential (-eV) | 40 |
| Ionization Potential | |
 First
|
7.646 |
| Second
|
15.035 |
| Third
|
80.143 |
| Flammability |
|
| Flammable solid
|
|
| Autoignition temp
|
473°C |
| Flashpoint
|
634°C (cc) |
| Energy Levels |
|
| Kα1 (intensity 100) |
1.2536 KeV |
| Kα2 (intensity 0) |
1.2536 KeV |
| Kβ1 (intensity 1) |
1.3022 KeV |
| Atomic Radii |
|
| Empirical
|
150 pm |
| Bohr Radius
|
145 pm |
| Covalent Radius
|
130 pm |
| Van der Waals
|
173 pm |
| Triple covalent
|
127 pm |
| Metallic
|
160 pm |
| Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 2 | IV | 0.71 | 0.57 | |
| V | 0.8 | 0.66 | ||
| VI | 0.86 | 0.72 | * | |
| VIII | 1.03 | 0.89 | C | |
| R, From r3 vs V plots. |
| C, Calculated from bond length - bond strength equations. |
| E, Estimated. |
| *, Most Reliable. |
| M, From Metallic Oxides. |
| A, Ahrens (1952) Ionic radius. |
| P, Pauling's (1960) Crystal Radius. |
| Oxidation States |
|
| Main
|
Mg+2 |
| Other
|
|
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
737.7 |
| M+ - M2+ |
1450.7 |
| M2+ - M3+ |
7732.6 |
| M3+ - M4+ |
10540 |
| M4+ - M5+ |
13630 |
| M5+ - M6+ |
17995 |
| M6+ - M7+ |
21703 |
| M7+ - M8+ |
25656 |
| M8+ - M9+ |
31642 |
| M9+ - M10+ |
35461 |
| Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 701 | 773 | 861 | 971 | 1132 | 1361 |
| Crystal Structure |
|
| Structure
|
Hexagonal close packed |
 |
a = 320.94 pm |
| b = 320.94 pm | |
| c = 521.08 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |