✔ 最佳答案
The answer is : C. bromine
A is not the answer. Mercury has giant metallic structure, and the constituent particles are mercury atoms, not molecules.
B is not the answer. Diamond has giant covalent structure, and the consituent particles are carbon atoms, but not molecules.
Both bromine and chlorine have simple molecular structure, and constituent particles are bromine and chlorine molecules respectively. Bromine molecules are held closer apart than chlorine molecules at room temperature and pressure, because bromine is a volatile liquid while chlorine is a gas.