Halogens are in group 7 and have 7 electrons in outer shell
The reactivity of halogens decreases down the group
At room temperature and room pressure....
- chlorine is a green gas
- bromine is an orange liquid
- iodine is a dark purple solid
Halogens are less reactive down the group as the outer shell gets further from the nucleus and electrons are less easily gained.
A more reactive halgen will displace a less reactive halogens from an aqueous solution of its salt.
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