Chlorine, bromine and iodine are in group ____ of the periodic table. These elements are called ____. The reactivity of the halogens ____ as you go down the ____. ____ is the most reactive halogen and iodine is the ____ reactive. The order of ____ of these three elements can be shown by carrying out ____ experiments. When a solution of ____ is added to a solution of the compound potassium ____, a reaction occurs and ____ is produced along with potassium ____. The chlorine has displace the bromine because it is ____ reactive.

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