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  4. Which of the following pairs of ions are isoelectronic and isostructural?

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Q. Which of the following pairs of ions are isoelectronic and isostructural?

Chemical Bonding and Molecular Structure

Solution:

$ClO _{3}^{-}$, and $SO _{3}^{2-}$ ions are isoelectronic and isostructural. Structural formula of given options is as follows:
image
Number of electrons
$CO _{3}^{2-}=4+18+2=24 ; SO _{3}^{2-}=6+18+2=26$
$ClO _{3}^{-}=7+18+1=26 ; NO _{3}^{-}=5+18+1=24$
Hence, $ClO _{3}^{-}$and $SO _{3}^{2-}$ are isoelectronic as both have same number of electrons and are isostructural as both are pyramidal in shape.