The compound with the formula K₂PO₄ doesn't exist. Here's why:

* Potassium (K) has a +1 charge.

* Phosphate (PO₄) has a -3 charge.

To balance the charges and form a neutral compound, you need three potassium ions (K⁺) to combine with one phosphate ion (PO₄³⁻). This results in the formula K₃PO₄.

Therefore, the name of the compound with the formula K₃PO₄ is potassium phosphate.