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In the d-block elements as we move along...

In the d-block elements as we move along a period
the atomic radius decreases in the beginning,
reaches minimum and then increases towards the
end of the series. Explain with appropriate reasons.

Text Solution

Verified by Experts

In a particular series of d-block elements, electron
filling takes place in the penultimate shell. Hence
their atomic size decreascs up to the `7^(th)` group and
reaches minimum and then again increases because
with the pairing of electrons, repulsive force also
increases. The repulsion among the added electrons
exceeds the increased force of attraction (due to the
increase of nuclear charge) after the `8^(th)` group.
Hence, atomic radius increases slightly.
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