Which row states a similarity and a difference between chlorine and bromine?
- Asimilarity: both are gases at room temperature and pressure; difference: chlorine and bromine have different colours
- Bsimilarity: both exist as diatomic molecules; difference: chlorine is more dense than bromine
- Csimilarity: both have atoms with seven outer-shell electrons; difference: only bromine will react with aqueous sodium chloride
- Dsimilarity: both react with aqueous potassium iodide; difference: chlorine is more reactive than bromine