Answer:
-1
Step-by-step explanation:
Chlorine is present in group seventeen. It has seven valance electrons. it is the member of halogen group. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their chemical properties are resemble greatly with each other. All halogen member need one electron to complete the octet and thus show -1 charge.
Properties of chlorine:
1. it is greenish-yellow irritating gas.
2. its melting point is 172.2 K
3. its boiling point is 238.6 K
4. it is disinfectant and can kill the bacteria.
5. it is also used in manufacturing of paper, paints and textile industries.