Chromium, calcium, and potassium are near each other on the periodic table and have some common characteristics but differ in chemical reactivity. which lists these metals in order from most reactive to least reactive?
calcium, chromium, potassium
chromium, calcium, potassium
potassium, calcium, chromium
potassium, chromium, calcium

The correct order is:

Potassium > calcium > chromium

Explanation:

Potassium belongs to the group of alkali metals with group number 1 in a periodic table. Potassium easily displaces hydrogen atom from the water molecule.

Where as calcium belongs to group (II) and easily displaces hydrogen atom from the water molecule.

In a reactivity series potassium is comes before the calcium metal which means that it is more reactive than calcium metal.

Potassium > calcium

Where as chromium metal is member of group 6 and chromium reacts with steam and acids to form hydroxides. But doesn't reacts with water(in liquid phase) which means it less reactive then potassium and calcium.

Potassium > calcium > chromium

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