How do you figure out the empirical formula between these two ions

Question

How do I put Sn^4+ and ClO2- into an empirical formula.

Answer 1

So, look at the charges on each ion.

Sn is +4

ClO₂ is 1-

It will therefore take 4 of the ClO₂^- anions to match up with 1 of the Sn⁴⁺ cations.

This results in the formula Sn(ClO₂)₄