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ICSE Class 10 Chemistry Question 18 of 25

Periodic Table, Periodic Properties and Variations of Properties — Question 13

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13
Question

Question 12

Which one has the largest size?

  1. Br
  2. I
  3. I-
  4. Cl
Answer

I-
Reason — Cl, Br and I belong to the same group (group 17) and between the three, I is the bottom most. As atomic size increases down the group hence, between Cl, Br and I, I has the largest atomic size. Between I and I-, atomic size of I- is larger as anion is larger than the parent atom. Hence, I- has the largest atomic size in the given elements.