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Krypton (Kr) differs the most from potassium.
I don't see any elements listed... but the elements that are most similar to calcium in behavior would be those directly above or below it; Mg (Magnesium) and Sr (Strontium).
cesium
The most common compound in salt replacers is Pottasium Chloride
potassium and chlorine
The behavior of krypton (Kr) differs most from potassium.
Krypton (Kr) differs the most from potassium.
Krypton (Kr) differs the most from potassium.
Krypton (Kr) differs the most from potassium.
Krypton (Kr) differs the most from potassium.
Krypton (Kr)
Most likely, this is Potassium's (K) atomic number.
The two most important alkali metals are sodium and potassium.
Among the elements listed in the question, potassium, by a large margin, is most reactive.
Cesium and Potassium are both elements that explode in Water!
rubidium
Potassium is most reactive with the element Oxygen. However, it should be noted that it is most reactive with a non-element: Water.