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| Chlorek potasu, KCl | K+ + Cl- ---> KCl |
| Wodorotlenek potasu, KOH | K+ + OH- ---> KOH |
| Tlenek potasu, K2O | 2K+ + O2- ---> K2O |
| Siarczan potasu, K2SO4 | 2K+ + (SO4)2- ---> K2SO4 |
| Izotop | Rozpowszechnienie w przyrodzie | Okres połowicznego zaniku | Typ rozpadu |
| 35K | _____ | 0,19s | ß+ |
| 36K | _____ | 0,342s | ß+, p |
| 37K | _____ | 1,23s | ß+ |
| 38mK | _____ | 0,926s | ß+ |
| 38K | _____ | 7,63min | ß+ |
| 39K | 93,2581% | _____ | _____ |
| 40K | 0,0117% | 1,25*109 lat | ß- |
| 41K | 6,7302% | _____ | _____ |
| 42K | _____ | 12,36h | ß- |
| 43K | _____ | 22,3h | ß- |
| 44K | _____ | 22,1min | ß- |
| 45K | _____ | 17,3min | ß- |
| 46K | _____ | 107s | ß- |
| 47K | _____ | 17,5s | ß- |
| _____ | 69s | ß- | |
| 49K | _____ | 1,3s | ß- |
| 50K | _____ | 0,7s | ß- |
| 51K | _____ | 0,38s | ß- |