Q. In $d$ -Block when atomic size of one series are compared with those of corrosponding element in other series :-
(I) Increase from the first $\left(\right.3d\left.\right)$ to second $\left(\right.4d\left.\right)$ series
(II) Increase from the second $\left(\right.4d\left.\right)$ to third $\left(\right.5d\left.\right)$ series
(III) Virtually the same as first $\left(\right.3d\left.\right)$ and in second $\left(\right.4d\left.\right)$ series
(IV) Virtually the same as second $\left(\right.4d\left.\right)$ and in third $\left(\right.5d\left.\right)$ series

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Solution:

$I & II & III & IV \\ 3d & 4d & 3d & 4d \\ \overset{\land }{4 d} & \overset{\land }{5 d} & \overset{\approx}{4 d} & \overset{\approx}{5 d}Lanthanidecontraction$