The formula for lead(IV) nitrite is Pb(NO₂)₄. Here's how we arrive at this formula:

* Lead(IV): This indicates that lead (Pb) has a +4 charge.

* Nitrite ion: The nitrite ion (NO₂) has a -1 charge.

To balance the charges, we need four nitrite ions for every one lead(IV) ion.

Therefore, the final formula is Pb(NO₂)₄.