00:02
There, in this question, we want to know which of these species is an exception to the octet rule.
00:07
So to answer this question, we need to construct some lewis structures, some lewis dot structures.
00:15
And the first compound we have is sf4.
00:18
Well, sulfur is in group 6 of the periodic table, so it has 6 valence electrons.
00:24
And each fluorine is a halogen in group 7a, so each fluorine has 7.
00:30
So i'm going to put the 7 in for the fluorine first.
00:33
First, remember sulfur has six.
00:41
So we're going to use four of those sulfur to form single bonds with the fluorine.
00:51
But there's still two remaining.
00:53
And when we're doing a lewis structure, we are told that when we have electrons remaining, they go on the central atom.
01:02
That means our sulfur has an extra pair of electrons on it.
01:07
So the sulfur has 10 total electrons around it.
01:12
Which of course violates or is an exception, it doesn't really violate, but it is an exception to the octet rule because the octet rule says only eight electrons.
01:28
So this one appears to be our correct answer.
01:31
We'll go ahead and put a little box around it while we go on and check our others.
01:37
So hbr, that's a pretty easy one...