# What formula represents lead(ll) chromate?

$P b C r {O}_{4}$
Canary yellow lead chromate is formed from $P {b}^{2 +}$ and $C r {O}_{4}^{2 -}$, whose 1:1 combination of course forms a neutral salt. What are the oxidation numbers of the metal ions in $P b C r {O}_{4}$?