For $\mathrm{NO}_{2}$, nitrogen has 5 valence electrons and each oxygen has 6, so the total is $5 + 2(6) = 17$ valence electrons.
For $\mathrm{CO}$, carbon has 4 valence electrons and oxygen has 6, so the total is $4 + 6 = 10$ valence electrons.
For
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