Draw the Lewis structures of the molecules below and use them to answer the following questions:
I.BH 3
II.NO 2
III.SF 6
IV.O 3
V.PCl 5
-Which of the molecules obeys the octet rule?
A)I
B)II
C)III
D)IV
E)V

Question

Draw the Lewis structures of the molecules below and use them to answer the following questions:
I.BH 3 
II.NO 2 
III.SF 6 
IV.O 3 
V.PCl 5 
-Which of the molecules obeys the octet rule?
A)I
B)II
C)III
D)IV
E)V

Quizplus · Accepted Answer

The only molecule that obeys the octet rule is IV (OS3U2B13S3U2B0), as all atoms have 8 valence electrons around them. The other molecules all have exceptions to the octet rule, such as the odd number of electrons in I, the presence of a lone electron on the nitrogen in II, the presence of a lone electron on the sulfur in III, and the presence of only 3 valence electrons on the oxygen in IV. PCl5 also has an exception to the octet rule, as it has 10 valence electrons around the central phosphorus atom.

Draw the Lewis Structures of the Molecules Below and Use