Which of the following triads has approximate | vedclass

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(D) The species $Fe$, $Co$, and $Ni$ belong to the $d$-block elements (transition metals) in the same period ($4^{th}$ period).In the $d$-block, the a

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$Fe, Co, Ni$

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(D) The species $Fe$, $Co$, and $Ni$ belong to the $d$-block elements (transition metals) in the same period ($4^{th}$ period).In the $d$-block, the atomic radii decrease slightly across a period due to the shielding effect of $d$-electrons, which almost balances the increase in nuclear charge.Consequently, the atomic radii of $Fe$ $(126 	ext{ pm})$, $Co$ $(125 	ext{ pm})$, and $Ni$ $(124 	ext{ pm})$ are approximately equal.In contrast, $Na^{+}$, $Mg^{2+}$, and $Al^{3+}$ are isoelectronic but have different nuclear charges, leading to a significant decrease in ionic radii $(Na^{+} > Mg^{2+} > Al^{3+})$.

List-$I$	List-$II$
$(1)$ $Ti^+$	$(A)$ $(n-1)d^4ns^2$
$(2)$ $_{30}Zn$	$(B)$ $(n-1)d^{10}ns^1$
$(3)$ $_{24}Cr$	$(C)$ $(n-1)d^2ns^0$
$(4)$ $_{29}Cu$	$(D)$ $(n-1)d^5ns^1$
	$(E)$ $(n-1)d^0ns^2$
	$(F)$ $(n-1)d^{10}ns^2$

Which of the following triads has approximately equal size?

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Match the elements in List-$I$ with their electronic configurations in List-$II$.

List-$I$ List-$II$

$(1)$ $Ti^+$ $(A)$ $(n-1)d^4ns^2$

$(2)$ $_{30}Zn$ $(B)$ $(n-1)d^{10}ns^1$

$(3)$ $_{24}Cr$ $(C)$ $(n-1)d^2ns^0$

$(4)$ $_{29}Cu$ $(D)$ $(n-1)d^5ns^1$

$(E)$ $(n-1)d^0ns^2$

$(F)$ $(n-1)d^{10}ns^2$

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