A) \[F{{e}^{2+}},N{{i}^{2+}}\]
B) \[Z{{r}^{4+}},T{{i}^{4+}}\]
C) \[Z{{r}^{4+}},H{{f}^{4+}}\]
D) \[Z{{n}^{2+}},H{{f}^{4+}}\]
Correct Answer: C
Solution :
In general, the atomic and ionic radii increases on moving down a group. But the elements of second transition series (eg, Zr, Nb, Mo etc.) have the almost same radii as the elements of third transition series (e.g., Hf, Ta, W etc.). This is because of lanthanide contraction i.e., imperfect shielding of one 4f-electron by another.
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