Which pair of elements belongs to same group

Which pair of elements belongs to same group
  1. Elements with atomic no. 17 and 38
  2. Elements with atomic no. 20 and 40
  3. Elements with atomic no. 17 and 53
  4. Elements with atomic no. 11 and 33

Solution

Atomic no. $17(\mathrm{Cl})$ and $53(\mathrm{I})$ are present in the same group ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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