| Francium | |
| Electrons per shell | 2,8,18,32,18,8,1 |
| Electron Configuration | [Rn] 7s1 |
| Ground state | 2S1/2 |
| Atomic Volume | cm3 mol-1 |
| Electronegativity | 0.7 |
| Magnetic ordering | No data |
 Thermal Properties |
|
| Enthalpy of Atomization | 71 kJ mol-1 @25°C |
| Enthalpy of Fusion | No data. |
| Enthalpy of Vaporisation | No data. |
| Heat Capacity | ? 15 J mol-1 K-1 |
| Thermal Conductivity | No data. |
| Thermal Expansion | No data. |
| Electrical Properties |
|
| Electrical resistivity | No data. |
| Electrical conductivity | 0.03 106/cm Ω |
| Chemical Properties |
|
| Electrochemical Equivalent | 8.3209 g Ah-1 |
| Valence Electron Potential (-eV) | 8 |
| Ionization Potential | |
 First
|
3.83 |
| Energy Levels |
|
| Kα1 (intensity 0) |
86.1 KeV |
| Kα2 (intensity 0) |
83.23 KeV |
| Kβ1 (intensity 0) |
97.47 KeV |
| Lα1 (intensity 100) |
12.0313 KeV |
| Lα2 (intensity 10) |
11.895 KeV |
| Lβ1 (intensity 38) |
14.77 KeV |
| Lβ2 (intensity 14) |
14.45 KeV |
| Lβ3 (intensity 2) |
14.9733 KeV |
| Lβ4 (intensity 2) |
14.3159 KeV |
| Lγ1 (intensity 8) |
17.303 KeV |
| Lγ2 (intensity 2.7) |
17.6268 KeV |
| Lγ3 (intensity 2) |
13.256 KeV |
| Ll (intensity 6) |
10.3801 KeV |
| Atomic Radii |
|
| Empirical
|
260 pm |
| Bohr Radius
|
No data. |
| Covalent Radius
|
No data. |
| Van der Waals
|
No data. |
| Triple covalent
|
No data. |
| Metallic
|
No data. |
| Oxidation States |
|
| Main
|
Fr+1 |
| Other
|
|
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
400 |
| M+ - M2+ |
2100 |
| M2+ - M3+ |
3100 |
| M3+ - M4+ |
4100 |
| M4+ - M5+ |
5700 |
| M5+ - M6+ |
6900 |
| M6+ - M7+ |
8100 |
| M7+ - M8+ |
12300 |
| M8+ - M9+ |
12800 |
| M9+ - M10+ |
29300 |
| Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 404 | 454 | 519 | 608 | 738 | 946 |