| Radium | |
| Electrons per shell | 2,8,18,32,18,8,2 |
| Electron Configuration | [Rn] 7s2 ![]() |
| Ground state | 1S0 |
| Atomic Volume | 45.2 cm3 mol-1 |
| Electronegativity | 0.9 |
| Magnetic ordering | Non-magnetic |
Thermal Properties |
|
| Enthalpy of Atomization | 163 kJ mol-1 @25°C |
| Enthalpy of Fusion | 7.15 kJ mol-1 |
| Enthalpy of Vaporisation | 136.7 kJ mol-1 |
| Heat Capacity | No data. |
| Thermal Conductivity | 18.6 W m-1 K-1 |
| Thermal Expansion | No data. |
| Critcal Temperature | No data. |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
Electrical Properties |
|
| Electrical resistivity | 1.00 x 10-6 Ω m |
| Electrical conductivity | ? 106/cm Ω |
Chemical Properties |
|
| Electrochemical Equivalent | 4.2165 g Ah-1 |
| Valence Electron Potential (-eV) | 20.1 |
| Ionization Potential | |
| 5.279 | |
| 10.148 | |
Energy Levels |
|
| 88.47 KeV | |
| 85.43 KeV | |
| 100.13 KeV | |
| 12.3397 KeV | |
| 12.1962 KeV | |
| 15.2358 KeV | |
| 14.8414 KeV | |
| 15.4436 KeV | |
| 14.7465 KeV | |
| 17.849 KeV | |
| 18.1708 KeV | |
| 13.658 KeV | |
| 10.6247 KeV | |
Atomic Radii |
|
| 215 pm | |
| No data. | |
| No data. | |
| No data. | |
| 159 pm | |
| No data. | |
Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 2 | VIII | 1.62 | 1.48 | R |
| XII | 1.84 | 1.7 | R | |
| 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 |
|
| Ra+2 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 509.3 | |
| 979 | |
| 3300 | |
| 4400 | |
| 5700 | |
| 7300 | |
| 8600 | |
| 9900 | |
| 13500 | |
| 15100 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 819 | 906 | 1037 | 1209 | 1446 | 1799 |
Crystal Structure |
|
| Body centred cubic | |
![]() |
a = 514.8 pm |
| b = 514.8 pm | |
| c = 514.8 pm | |
| α = 90° | |
| β = 90° | |
| γ = 90° | |