Which pair of elements with the given atomic numbers is expected to have similar properties?

Which pair of elements with the given atomic numbers is expected to have similar properties?
  1. 40,72
  2. 20,36
  3. 10,28
  4. 11,12

Solution

$\mathrm{Zr}(40), \mathrm{Hf}(72)$ have similar properties as they belong to same group and have same valence shell electronic configuration.

Asked in: JEE Main 2012 (19 May Online)

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