* Nitrogen's Valency: Nitrogen typically forms three covalent bonds (it has 5 valence electrons, but needs to gain 3 more to complete its octet).
* Bromine's Valency: Bromine typically forms one covalent bond (it has 7 valence electrons, and needs to gain 1 more to complete its octet).
To satisfy the valency rules, nitrogen would need to form three bonds with bromine. This means the maximum number of bromine atoms that can bond with one nitrogen atom is three, resulting in NBr₃ (nitrogen tribromide).
Therefore, a compound with the formula N₂Br₅ is not possible due to the valency limitations of nitrogen and bromine.
