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(A) trigonal pyramidal molecular shape occurs when the central atom has three bond pairs and one lone pair of electrons.$1$. $NI_3$: Nitrogen has $5$

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$I$ and $III$

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(A) trigonal pyramidal molecular shape occurs when the central atom has three bond pairs and one lone pair of electrons.$1$. $NI_3$: Nitrogen has $5$ valence electrons. It forms $3$ bonds with $I$ atoms and has $1$ lone pair. Shape: Trigonal pyramidal.$2$. $I_3^-$: The central $I$ atom has $3$ lone pairs and $2$ bond pairs. Shape: Linear.$3$. $SO_3^{2-}$: Sulfur has $6$ valence electrons. It forms $3$ bonds with $O$ atoms (one double,two single) and has $1$ lone pair. Shape: Trigonal pyramidal.$4$. $NO_3^-$: Nitrogen has $5$ valence electrons. It forms $3$ bonds with $O$ atoms and has no lone pairs. Shape: Trigonal planar.Thus,$NI_3$ $(I)$ and $SO_3^{2-}$ $(III)$ have a trigonal pyramidal shape.

Among the following species,which two have a trigonal pyramidal shape?
$I. NI_3$ $II. I_3^-$
$III. SO_3^{2-}$ $IV. NO_3^-$

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Among the following species,which two have a trigonal pyramidal shape?$I. NI_3$ $II. I_3^-$$III. SO_3^{2-}$ $IV. NO_3^-$