The properties of the sodium halides studied are well known. Perhaps the most significant difference is their solubility in water at 298.15 K (0.983 mol kg-1 for NaF, 6.146 mol kg-1 for NaCl, 9.186 mol kg-1 for NaBr, and 12.340 mol kg-1 for NaI).
What explains this in short and in simple way? The sequence is similar in other solvent.
For potassium halides: 17.500, 4.803, 5.500, 4.500 ?????