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 $(Na^{+} > Mg^{2+} > Al^{3+})$.

Which of the following triads has approximately equal size?

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