Here's the breakdown:

* Dinitrogen: The prefix "di-" indicates two nitrogen atoms (N₂).

* Pentoxide: The prefix "penta-" indicates five oxygen atoms (O₅).

In ionic form:

Dinitrogen pentoxide exists as the nitrate ion (NO₃⁻). In its solid form, it exists as two nitrate ions bonded to a nitrogen cation (N⁵⁺). This can be represented as [NO₃]⁺[NO₃]⁻ or N⁵⁺(NO₃)₂.

Note: While dinitrogen pentoxide can be represented in ionic form, it's important to remember that it's a covalent compound, meaning it's held together by shared electrons rather than the electrostatic attraction between ions.