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  4. In NO3- ion number of bond pair and lone pair of electrons on nitrogen atom are :-

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Q. In $NO_3^-$ ion number of bond pair and lone pair of electrons on nitrogen atom are :-

AIPMTAIPMT 2002Chemical Bonding and Molecular Structure

Solution:

In $NO _3^{-}$ion,
Due to the presence of one negative charge, number of valence electrons= $5+$ $1=6$

One $O$-atom forms two bonds (= bond) and two $O$-atom are shared with two electrons of $N$-atom
Thus, $3 O$-atoms are shared with 8 electrons of $N$-atom.
Number of bond pairs (or shared pairs) $=4$
Number of lone pairs $=0$