In period 4 of the periodic table, the elemen | vedclass

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(C) In a period, moving from left to right, the atomic radius decreases due to an increase in effective nuclear charge. In period $4$, the elements ra

Vedclass · Accepted Answer

$K$ & $Br$

Vedclass · Answer

(C) In a period, moving from left to right, the atomic radius decreases due to an increase in effective nuclear charge. In period $4$, the elements range from $K$ (Group $1$) to $Kr$ (Group $18$). Excluding noble gases (which have larger van der Waals radii), the element with the largest atomic radius is $K$ (Potassium) and the element with the smallest atomic radius is $Br$ (Bromine). Therefore, the correct pair is $K$ & $Br$.

In period $4$ of the periodic table, the elements with the highest and lowest atomic radii are respectively:

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