Plumbic nitrate is a bit of a tricky name. It refers to lead in its +4 oxidation state, which is not very common. The more common oxidation state for lead is +2.

Here's how we can figure out the chemical formula:

* Plumbic indicates lead (Pb) in the +4 oxidation state.

* Nitrate is the polyatomic ion NO₃⁻ with a -1 charge.

To balance the charges, we need two nitrate ions for every lead ion:

* Pb⁴⁺ + 2 NO₃⁻ → Pb(NO₃)₄

So, the chemical formula for plumbic nitrate is Pb(NO₃)₄. However, it's important to note that plumbic nitrate is a very unstable compound and not commonly encountered.