7. Which of the following element shows the same reactivity as Chlorine? a. Fluorine
C. Magnesium
b. Sodium
d. Sulfur

Chlorine, bromine and iodine react with hot iron to produce a brown solid. Hence, chlorine, bromine and iodine exhibit similar chemical properties. The observations also show that the reactivity of the halogens in their reactions with iron decreases from chlorine → bromine → iodine.

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