Shweta Thakur posted an Question
May 25, 2021 • 10:26 am 30 points
  • IIT JAM
  • Chemistry (CY)

Why is the reactivity of alkali metal increases down the group while reactivity of halogens decreases?

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    Priyanshu kumar best-answer

    The answer to your question is quite simple.The alkali metals of group 1 grow larger in size downwards and since the effective nuclear charge remains the same as we go down group 1 the number of shells also increases and so it is easy to lose an electron and therefore as we move downwards the reactivity increases. However in group 17 the halogens have to gain an electron. So when the size increases and the number of shells increases the attraction of electrons decreases as we move away from the nucleus and so it is difficult to gain an electron as we move downwards.

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