The correct order of atomic radii of given el | vedclass

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Question

(A) In the periodic table,atomic radii decrease from left to right across a period and increase from top to bottom down a group.$Be$ $(Z=4)$ and $B$ $

Vedclass · Accepted Answer

$B < Be < Mg$

Vedclass · Answer

(A) In the periodic table,atomic radii decrease from left to right across a period and increase from top to bottom down a group.$Be$ $(Z=4)$ and $B$ $(Z=5)$ belong to the $2$nd period,while $Mg$ $(Z=12)$ belongs to the $3$rd period.Within the $2$nd period,the atomic radius decreases from left to right,so $Be > B$.Since $Mg$ is in the $3$rd period,it has a larger atomic radius than elements in the $2$nd period.Therefore,the correct order of atomic radii is $B < Be < Mg$.

The correct order of atomic radii of given elements is

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