![]() So we have carbon with 4 hydrogens around it. Tetra don't forget is a prefix for 4, so if the central atom was 4, 4 atoms around it. The last thing you're probably going to see in class is going to be tetrahedral. So this is the trigonal pyramidal notice the massive differences of lone pair of electrons, this one doesn't have them, this one does. Okay it's going to kind of sit on it and this is, the bond that'll go between these hydrogens is 107.3 okay it's my favorite radio station actually. ![]() They're going to push those hydrogens down into a pyramid shape hence pyramidal. This one doesn't have them, this one does, the same exact idea is going to happen, these guys are going to go crazy and they want to have a lot of space. So we have our nitrogen, I'm just going to draw this regular know they're the same thing, between this one and this one the major difference is the lone pair of electrons. Trigonal pyramidal, ammonia is a good example of trigonal pyramidal. Something very similar to a trigonal planar is trigonal pyramidal. There's 3 atoms around the central atom hence the trigonal. They're actually going to be equally spaced throughout, that's an example of trigonal planar. They are as far apart from each other as possible, this is going to be 120 degree angle between the different oxygen. And these guys are going to want to be, these are in one plane hence trigonal planar they're in one plane. Sorry I'll draw the lone pair of electrons around there also to make it better. We have sulphur and this also is resonated, I'll just draw one of the resonated structures it looks like this. The other one just had 2, this one has 3 making, hence the trigonal planar. The third type is the trigonal planar, these guys have a central atom and 3 electrons around them. These lone pair of electron here and here the bent molecule different than the linear molecule, they want, they're actually going to make these guys closer to each other. It doesn't matter the electrons are still going to want as much room as possible making these guys push down making it look like this also a bent molecule. Notice the difference between this guy is this has 2 lone pairs of electrons this guy only has one. Ozone is O3 it looks, it's a resonated model I'll just do one of them, it looks like that. The angle between this is 104.5 okay another type of bent molecule you'll see is something like ozone. The difference between linear and bent are these lone pairs notice the linear doesn't have the lone pairs in the central atom but the bent however does which pushes that down making it bent. So these guys create, have as much room as they can to like move around and play and these guys are kind of pushed down. So the bonded ones are a little bit more restricted so they're going to push these guys down so what it really looks like is this, you've probably seen this before. Well actually we want to have these lone pair of electrons, these un bonded pairs want to have as much room to play around as possible. We have lone pairs of electrons and 2 hydrogens bound to it. Let's take water for example, water I'll just draw it like this, water on a Lewis Dot Structure looks like this right. ![]() So these 2 types of molecules are linear molecules, they're straight across, something that's close to linear but not quite is a Bent molecule. So carbon monoxide is triple bonded and no matter what these are going to be straight across from each other an angle of 180. Anytime you see atoms no matter what they are, they're going to have a linear shape. So they're actually going to create a linear form, this angle is going to be 180 degrees as far apart from each other as it possibly can get a linear shape.Īnother type of linear that you might see is carbon monoxide, which is 2 atoms. We know these electrons are repulsed by each other, meaning that there're going to be as far apart each other as they can. It looks like this, and we want these guys, these oxygens to be as far apart as possible. So carbonmonoxie, sorry we're going to talk about carbon dioxide. So let's take a look at those and see those and see how they line up. Okay so one of the first shapes we're going to talk about is the linear shape, so I'm going to take this linear as carbon dioxide and carbonmoxide. So we've drawn those dot diagrams, now we're going to take them and make them 3 dimensional models and actually, what they actually look like in space and we're going to call that VSEPR, Valence, Shell, Electron Pair Repulsion. Geometries predicted using VSEPR theory (bonded groups only).Alright so we're going to talk about VSEPR Model these are the shapes that covalent compounds take the form of when they come together. ![]()
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