Which ion has the greatest radius among the f | vedclass

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(D) The ionic radius increases as we move down a group in the periodic table due to the addition of new electron shells. Comparing the halide ions $(F

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$I^{-}$

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(D) The ionic radius increases as we move down a group in the periodic table due to the addition of new electron shells. Comparing the halide ions $(F^{-}, Cl^{-}, Br^{-}, I^{-})$,$I^{-}$ belongs to the $5^{th}$ period,while $F^{-}$ belongs to the $2^{nd}$ period,$Cl^{-}$ to the $3^{rd}$ period,and $Br^{-}$ to the $4^{th}$ period. Since $I^{-}$ has the highest number of shells,it has the largest ionic radius. Therefore,the correct option is $(D)$.

$A$. Element	$B$. Atomic Radius $(pm)$
$A$. $Be$	$I$. $74$
$B$. $C$	$II$. $77$
$C$. $O$	$III$. $66$
$D$. $B$	$IV$. $88$
$E$. $N$	$V$. $111$

Which ion has the greatest radius among the following?

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Assertion: The atomic radius of gallium is higher than that of aluminium.
Reason: The presence of additional $d$-electrons offers poor screening effect for the outer electrons from increased nuclear charge.

Match the elements in Column-$A$ with their correct atomic radii in Column-$B$ (in $pm$).

$A$. Element $B$. Atomic Radius $(pm)$

$A$. $Be$ $I$. $74$

$B$. $C$ $II$. $77$

$C$. $O$ $III$. $66$

$D$. $B$ $IV$. $88$

$E$. $N$ $V$. $111$

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$(a)$ Gains an electron
$(b)$ Loses an electron

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