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Answer the following question with respe...

Answer the following question with respect to the modern periodic table.
i. Explain the gradation in reactivity of halogen family.

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While going top to bottom within group 17, a gradation is observed in their physical state. Fluorine `(F_(2))` and chlorine `(CI_(2))` are gases, bromine `(Br_(2))` is a liquid while iodine `(I_(2))` is a solid.
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