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Increasing order of reactivity among gro...

Increasing order of reactivity among group - 1 elements is `Li < Na < K < Rb < Cs`, whereas among group - 17 elements it is `F > Cl > Br > I`- explain.

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Reactivity of group - I element is proportional to metallic nature and metallic nature increases from Li to Cs. So, the order of reactivity is `Li < Na < K < Rb < Cs`.
Reactivity of group - 17 elements is proportional to non-metallic nature. Non-metallic nature decreases from F to I. So, the order of reactivity is `F > Cl > Br > I`.
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