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Question

(A) The correct answer is $A$. $Fe - Co - Ni$. In the $3d$ transition series,as the atomic number increases,the number of $d$-electrons also increases

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$Fe - Co - Ni$

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(A) The correct answer is $A$. $Fe - Co - Ni$. In the $3d$ transition series,as the atomic number increases,the number of $d$-electrons also increases. This leads to an increase in the screening effect,which effectively counterbalances the increase in nuclear charge. Consequently,the atomic radii of elements like $Fe$,$Co$,and $Ni$ remain practically the same.

The atomic radii of the elements are almost the same for which series?

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