In the gas phase, the oxide N₂O₅ has a structure with an N - O - N core, with the other four oxygen atoms in terminal positions. In contrast, in the solid phase, the stable form is [NO₂]⁺[NO₃]^-. Draw one Lewis structure of the molecular form (with N–O–N single bonds) and all possible resonance structures of both ions observed in the solid. Remember that second-period elements never exceed an octet.