Ammonium trioxonitrate(V) is the formal name for ammonium nitrate. Here's how we break it down:

* Ammonium refers to the positively charged ion NH₄⁺.

* Trioxonitrate(V) refers to the negatively charged ion NO₃⁻. The "V" in the name indicates that the nitrogen atom has an oxidation state of +5.

Therefore, the chemical formula for ammonium nitrate is NH₄NO₃.