This answer is very close. The term isoelectronic means that an atom or molecule has the same number of atoms and the same number of valence electrons. NO has 11 total valence electrons not 10 as found in N₂. These molecules are almost isoelectronic with each other. They both have a triple bond between the two atoms and one non-bonded pair of electrons on each atom. The only difference is that one pesky extra electron which makes NO "radically" different : )