Answer:
In case of transition elements, the
electrons are filled in \[(n-1)\] d-sub-shell and they exert screening effect
as a result of which the atomic size is expected to increase. Thus, as we move
from left to the right in a transition series, the increase in the magnitude of
nuclear charge (leading to decrease in size) is almost balanced by the increase
in the shielding effect (leading to increase in size). Because of these two
opposing tendencies, there is a very small change in the atomic size (or atomic
radii) as we move along the transition series. In s and p-block elements, as we
move along a period the electrons are filled in the valence s and p orbitals.
These electrons do not exert as much screening effect as are exerted by the
electrons present in the d-orbitals. There is a gradual increase in effective
nuclear change leading to decrease in atomic size along a particular period.
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