MHT CET · Chemistry · d and f Block Elements
The pair, that referred as 'chemical twins' is
- A Ac, Cf
- B Hf, Ta
- C \(\mathrm{Tc}\), \(\mathrm{Re}\)
- D \(\mathrm{La}, \mathrm{Ac}\)
Answer & Solution
Correct Answer
(C) \(\mathrm{Tc}\), \(\mathrm{Re}\)
Step-by-step Solution
Detailed explanation
Due to the presence of \(f\) -electrons, the nucleus is not screened effectively. Thus, the atomic radius of elements of second transition series (ie, Nb, Mo, Tc etc) is similar to that of corresponding third transition series elements (ie, Ta, W, Re). Hence, Nb-Ta; Mo-W or Tc-Re are called chemical twins.
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