What category of octet exception does this molecule belong to?

[Select all that apply.]

Question

What category of octet exception does this molecule belong to?

[Select all that apply.]

BlackTom AI · Accepted Answer

First, consider the electron count of the molecule shown, O=N=O. The total valence electrons come from O (6) + N (5) + O (6) = 17 electrons, which is an odd number.

Option 1: Molecules or polyatomic ions with an odd number of electrons. This is correct because an odd total number of valence electrons leads to a radical species, meaning the octet rule is not satisfied for all atoms in the molecule.

Option 2: Molecules or polyatomic ions with atoms that have fewer than an octet of valence electrons. This would be true for bestowing an incomplete octet on certain atoms in some species (like boranes or certain carbocations). However, in NO2-like species with an odd electron count, the issue is not simply some atom having fewer than eight electrons; rather, the molecule has an unpaired electron (radical) due to the odd total. Thus this option does not accurately describe the octet situation for this molecule.

Option 3: Molecules or polyatomic ions with atoms that have more than an octet of valence electrons. Expanded octets occur in species with second-row or third-row elements that can accommodate more than eight electrons (like SF4, PCl5). Nitrogen in NO2-like species does not routinely achieve more than eight electrons in a stable valence arrangement; the presence of an odd electron makes the primary concern the odd electron count, not an expanded octet. Therefore this option is not appropriate for this molecule.

Option 4: This molecule does not violate the octet rule. This is incorrect because the 17-valence-electron count implies a radical with an unpaired electron, which means the octet rule is violated for at least one atom (the unpaired electron situation).

In summary, the molecule belongs to the category of having an odd number of electrons, i.e., it is a radical species, and the other options do not correctly describe its octet behavior.

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