Periodic TableEasy
Question
which of the following pairs has the same size ?
Options
A.Fe2+, Ni2+
B.Zr4+, Ti4+
C.Zr4+, Hf4+
D.Zn2+, Hf4+
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 (eg, Hf, Ta, W etc). This is because of lanthanide contraction ie, imperfect shielding of on 4f -electron by another.
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