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Charge-radius ratio of common cations and Al13.
| Cation | Ionic radius (Å) | Hydrated radius (Å) | Charge-radius ratio |
|---|---|---|---|
| Li+ | 0.60 | 3.82 | 0.262 |
| Na+ | 0.95 | 3.58 | 0.279 |
| K+ | 1.33 | 3.31 | 0.302 |
| Mg2+ | 0.65 | 4.28 | 0.467 |
| Ca2+ | 0.99 | 4.12 | 0.485 |
| Ba2+ | 1.35 | 4.04 | 0.495 |
| Al13 | – | 9.50 | 0.737 |
Compiled from reference33.
