Which of the following sequences is correct f | vedclass

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(A) Ionic radius increases with the number of shells. $I^{-}$ has $5$ shells,$Se^{2-}$ and $Br^{-}$ have $4$ shells,and $O^{2-}$ and $F^{-}$ have $2$

Vedclass · Accepted Answer

$I^{-} > Se^{2-} > Br^{-} > O^{2-} > F^{-}$

Vedclass · Answer

(A) Ionic radius increases with the number of shells. $I^{-}$ has $5$ shells,$Se^{2-}$ and $Br^{-}$ have $4$ shells,and $O^{2-}$ and $F^{-}$ have $2$ shells.For isoelectronic species (ions with the same number of electrons),the ionic radius decreases as the atomic number $(Z)$ increases because of the greater nuclear pull.$1.$ For $Se^{2-}$ $(Z=34)$ and $Br^{-}$ $(Z=35)$: $Se^{2-} > Br^{-}$.$2.$ For $O^{2-}$ $(Z=8)$ and $F^{-}$ $(Z=9)$: $O^{2-} > F^{-}$.Therefore,the correct decreasing order is: $I^{-} > Se^{2-} > Br^{-} > O^{2-} > F^{-}$.

Which of the following sequences is correct for the decreasing order of ionic radius?

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