Here's how to determine the formula for the compound made of lead(II) and chromate ions:

* Lead(II) ion: Pb²⁺

* Chromate ion: CrO₄²⁻

To form a neutral compound, the charges must balance. Since both ions have a charge of 2, they combine in a 1:1 ratio.

Therefore, the formula for the compound is PbCrO₄.

This compound is known as lead(II) chromate.