24Group 7 HalogensMedium1 mark
Which row about the similarities and differences between chlorine and bromine is correct?
| similarities | differences | |
|---|---|---|
| A | Both are gases at room temperature and pressure. | Chlorine and bromine have different colours. |
| B | Both exist as diatomic molecules. | Chlorine is denser than bromine. |
| C | Both have atoms with seven outer-shell electrons. | Only bromine will react with aqueous sodium chloride. |
| D | Both react with aqueous potassium iodide. | Chlorine is more reactive than bromine. |