The chemical formula of potassium oxide is K₂O. Here's how we arrive at that:

* Potassium (K) is in group 1 of the periodic table and forms a +1 ion (K⁺).

* Oxygen (O) is in group 16 of the periodic table and forms a -2 ion (O²⁻).

To balance the charges, we need two potassium ions (2 x +1 = +2) to combine with one oxide ion (-2). This gives us the formula K₂O.