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This is Dr. B. Let's do the SeO2 Lewis structure. Se, on the periodic table, 6 valence electrons.
Oxygen 6, we've got two of them, for a total of 18 valence electrons. So we'll put the
Se in the center and the Oxygens on either side. And we'll put two electrons between
the atoms to form the bonds. Around the outside, we have 4, 6, 8, 10, 12, 14, 16, and then
two here, 18. We don't have eight valence electrons here, we don't have an octet for
Se. So let's take two electrons from the outside and move them to the center. We'll just put
these two here, right there. That seems to solve the problem. Now we have 8 valence electrons
on the Se, and the Oxygens, they also have 8. Since we have Se here in this Lewis structure
for SeO2, we'll probably want to check the formal charges to make sure that this is the
best structure for SeO2. So let's do that. So this Oxygen right here, 6 valence electrons
on the periodic table. Six that are nonbonding, minus two that are bonding. So 6 - 6 - 1 is
-1. For the Se, we have 6 valence electrons. We have 2 that are nonbonding, and then we
have 2 plus 4 that are bonding; six. So 6 - 2 - 3 is a positive 1. And finally, for
this Oxygen over here, we have 6 valence electrons, minus the 4 nonbonding, minus 4 bonding divided
by 2. Six minus 4 minus 2 is zero. Because I see these positive and negative charges
here, I think this might not be the best structure. When I see a +1 here, that makes me think
I'm going to need to add another double bond. So what I'll do is, I'll take these two here
and share them right here and recalculate my formal charges. So by adding this double
bond here, I now see that my formal charges are all zero. I've recalculated all these
numbers. Because of that, that tells me that this is the best Lewis structure for SeO2.
This is Dr. B., and thanks for watching.