## Chemistry and Chemical Reactivity (9th Edition)

$B.O.=N.\ Shared\ pairs\div N.\ links$ $NO_2^+$: $4/2=2$ $NO_2^-$: $3/2=1.5$ $NO_3^-$: $4/3=1.33$ Since bond length decreases with bond order, the NO bonds will be the longest in $NO_3^-$ and the shortest in $NO_2^+$.