In the Lewis structure shown here, A, D, E, Q, X, and Z represent elements in the first two rows of the periodic table. Identify all six elements so that the formal charges of all atoms are zero.

Video transcript

Hello everyone. So in this video we're given this skeleton of a Lewis structure and we're trying to figure out each and every single one of the possible items. It's labeled A. All the way through F. Let's go ahead and figure this out. So the possible choices that were given is all the elements from the 1st and 2nd periods of the PR table. So that does limit our options a little bit. And that's good because we have fewer items to kind of consider. So first one to consider. Let's see. I want to start off with our oxygen because that's something that we know. So oxygen likes to have So likes to have two bonds and in our skeletal structure here the one with two bonds is going to be Well, let's see here we have our F. So when we say that oxygen is equal to F. Now let's go ahead and consider our hydrogen. So hydrogen also lets indicated here. So we have an Oh, okay. And then for hydrogen, it likes to have or likes to be a terminal atom. And why is that? It's because of the duet rule, which means the hydrogen can only have two electrons for it to be happy. Instead of the octet rule where items like to have eight atoms or electrons. So looking for terminal atoms with a single bound, that's going to be our A and C. We don't need these extra electrons for hydrogen because of the duet role. So that's going to be again A and C. So we'll have an H and H right over here. Next thing to consider is of course going to be our carbons. So like our oxygen, we have a predicted number of bonds. Carbon likes to have four bonds. So you can see in our structure here, the one that's a central carbon would be R, B and R E. For E. We have a double bond. So that's 1234 bonds and that's still considered as the four. Again, that would be B and E. So put it in here, that's carbon and a carbon. Okay, And lastly, the last two, they're similar with one bond, a single bond and three lone pairs. So to follow the formal charge, we have one bond again and the three lone pairs and that gives us seven electrons. Flooring has seven valence electrons. So that would give a formal charge of zero. So then our last one, our flooring would be for Adams, D and G. This F and this is A F. So again, back to our carbon here, we know that it likes to have more bonds and it is usually the least electro negative, therefore it's going to be our central atom. So we see in chemistry usually that carbons will be our central item. So again, her answers then would be the oxygen would be for f, hydrogen would be a C. Carbon would be B and E. And our flooring would be D and G. And that's going to be my final answer for this problem. Thank you all so much for watching.