Which molecule below would have a Lewis structure that is an exception to the octet rule?

Question

Quizplus · Accepted Answer

All the molecules listed (BH3, NO, SiH4, PF5) are exceptions to the octet rule. BH3 and NO have less than 8 electrons around the central atom, SiH4 follows the octet rule but is included possibly due to a misunderstanding, and PF5 has more than 8 electrons around the central atom (phosphorus can have an expanded octet).

Which Molecule Below Would Have a Lewis Structure That Is