Arrange the following elements in increasing | vedclass

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(B) Atomic radius generally increases down a group and decreases across a period from left to right. $Na$ $(Z=11)$ and $Mg$ $(Z=12)$ belong to the $3^

Vedclass · Accepted Answer

$Mg < Na < K < Rb$

Vedclass · Answer

(B) Atomic radius generally increases down a group and decreases across a period from left to right. $Na$ $(Z=11)$ and $Mg$ $(Z=12)$ belong to the $3^{rd}$ period,while $K$ $(Z=19)$ and $Rb$ $(Z=37)$ belong to the $4^{th}$ and $5^{th}$ periods respectively. Across the $3^{rd}$ period,atomic radius decreases from $Na$ to $Mg$,so $Mg Down Group $1$,atomic radius increases as $Na Combining these trends,the order is $Mg < Na < K < Rb$.

Arrange the following elements in increasing order of their atomic radius: $Na$,$K$,$Mg$,$Rb$.

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