The symbol for chlorine is Cl.
The atomic mass for chlorine is 17 and the mass number is 35.453.
The period number for chlorine is 3 and the group number is 17.
Chlorine a group name is halogen and it is a non-metal.
Chlorine is a gas.
Use number one
Chlorine is used as a disinfectant to treat things such as drinking water and pool water.
Use number two
Chlorine is used to make PVC.
Use number three
Chlorine is used as an oxidising agent in substitution reaction.