* Nitrogen Dioxide (NO2): This molecule has one nitrogen atom and two oxygen atoms.

* Bromine Molecule (Br2): This molecule consists of two bromine atoms bonded together.

Size Comparison:

* Atomic Size: Bromine atoms are significantly larger than nitrogen and oxygen atoms.

* Bond Length: While the double bond in NO2 is shorter than the single bond in Br2, the difference in atomic size outweighs this effect.

Conclusion:

A bromine molecule (Br2) is larger than a nitrogen dioxide molecule (NO2).