To determine the correct model that represents the chemical formula \( \text{NO}_2 \) (nitrogen dioxide), we need to focus on the composition of the molecule:
- N represents nitrogen (1 atom).
- O represents oxygen (2 atoms).
In diagrams or models representing chemical formulas, nitrogen would typically be shown as one symbol (often represented by a letter 'N') and oxygen would be shown as two symbols (typically represented by two 'O's).
You need to look for a model or a representation that shows one nitrogen atom bonded to two oxygen atoms. Without the visuals of the models (A, B, C, D) provided, I cannot specifically identify which model matches.
However, if you have descriptions for models A, B, C, and D, please share them and I can help you identify which one represents \( \text{NO}_2 \).