Final answer:
NO2 has sp2 hybridization, leading to a bent molecular shape and polar character, regardless of whether the nonbonding electron occupies a hybridized or unhybridized orbital. The resonance of electron distribution contributes to its properties.
Step-by-step explanation:
The NO2 molecule is bent due to its sp2 hybridization and to the presence of a lone electron. If we assume the lone nonbonding electron on the N atom occupies an unhybridized atomic orbital, the molecule would still be polar and bent, but the bond angle might differ somewhat from the expected approximately 120° resulting from sp2 hybridization. Using Valence Shell Electron Pair Repulsion (VSEPR) theory, the molecule's shape is predicted because electron pairs, including the lone electron, will repel each other and take positions as far apart as possible. This bent geometry causes the molecule to be polar. The concept of resonance is also crucial for understanding the distribution of electrons in NO2, as the actual electronic structure is the average depicted by all resonance forms, not fluctuating between them.