Potassium does not form molecules. Molecules, unlike ions, don't hold electric charges. An exception would be if you use the word molecule to describe a polyatomic ion, but Potassium is never a part of a polyatomic ion.
Cl2 would be a molecule. H2O would be a molecule. HSO4- would be a polyatomic ion (which is formed via molecular/covalent bonds). But KCl is not a molecule.
Without trying to sound too technical, here lies the difference. If I had 10 H2O units, there would be 10 separate en ies, each of them being an individual H2O. Each of these H2O units is what we call a molecule,. Simple enough. If i had 10 KCl, there would just be 10 K+ ions, and there would be 10 Cl- ions, not bunched into 10 separate KCl molecules, but rather you would have 20 (separate) charged ions that would gather in a crystalline formation
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