Do polyatomic ions with an odd number of electrons obey the octet rule?

1 Answer
anor277
Dec 21, 2016

Of course they cannot........

Explanation:

So I can give you a well-worn example.

NO_2, "nitrogen(IV) dioxide" clearly has an odd electron. Why clearly?

A reasonable Lewis structure would be O=N^(+)-O^-; there are 6 electrons around nitrogen and thus it bears a positive charge. Because there are only 6 valence electrons around nitrogen, this centre bears (i) a formal positive charge; and (ii) a single, nitrogen-centred electron.

The lone electron on nitrogen is conceived to couple with another NO_2 centre to form the O_2N-NO_2 dimer, where there is again formal charge separation. Can you represent this by means of Lewis structures?

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