NO3 pai kitne negative charge hote hai class 11
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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
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