Account for the variation of atomic size...

Account for the variation of atomic size along 3d-block elements.

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(i) As we move from Sc (21) to Cr (24), atomic radius decreases because effective nuclear charge increases.
(ii) Atomic radius from Cr to Cu remains almost the same because the increase in the nuclear charge in compensated by the screening effect produced by 3d-electrons.
(iii) Zinc has a completely filled d-subshell. Hence, atomic radius is larger than that of copper.

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Account for the variation of atomic size along 3d-block elements.

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