Binary molecular compounds are composed of two nonmetal elements, such as carbon and oxygen which form carbon dioxide, CO2 . Another molecular compound is dinitrogen pentoxide, N2O5 . We know that N2O5 could not be an ionic compound because nitrogen and oxygen are both nonmetals and would both be negative as ions.

Is dinitrogen pentoxide a metal?

…as sulfur trioxide (SO₃) and dinitrogen pentoxide (N₂O₅), in which the nonmetal exhibits one of its common oxidation numbers, are known as acid anhydrides. These oxides react with water to form oxyacids, with no change in the oxidation number of the nonmetal; for example,N₂O₅ + H₂O → 2HNO₃.

Is pentoxide a metal or nonmetal?

That is not a non-metallic oxide comprising an oxide of metal elements, mostly acidic oxides, such as typical: water (H2O), sulfur dioxide (SO2), carbon dioxide (CO2), phosphorus pentoxide (P2O5) and the like.