 Let's show how to make a molecule from Lewis structures or Lewis dot structures of atoms now so Let's try this one. It says show how to Form lithium fluoride from the constituent elements Lithium and fluorine so in order to do that you're going to have to Draw a Lewis dot structures of the atoms lithium and fluorine so you know that You can get those Valence electrons from the periodic table. So lithium is a group one element. So it's got the one valence electron and Fluorine is a group 17 element. It's got the seven valence electrons. So I'm just going to and I'm drawing them in such a way as to leave the open Space for the electron on the side Where lithium is so so I can easily show the electron moving into that spot that open orbital But anyway, so what we need to do is we need to in this case We're going because this is a lithium's a metal and fluorine is a non-metal We're going to make an ionic bond here We're going to show the transfer of the one electron from fluorine or from lithium to fluorine We're going to show that using what we call a fish with arrow So that's an arrow with just one side on it one side of the head This will help you a lot down the road when you take more chemistry classes. So let's just do it this way starting this way Or show the transfer to electrons will do a double-headed error I'm back and look at that last video if you haven't seen that but anyway, so So when we do this what happens? So this is a reaction, right? We're actually transferring an electron from the lithium atom to the fluorine atom And we're making two new particles one of them's a lithium without that electron so It's going to be a positively charged lithium or the lithium ion and Fluorine is going to have that electron added to it So if we wanted to draw its Lewis structure It looks like the Noble gas configuration, right? It's got a full octet of electrons So now what we have is we have a cat ion They're going to so the positive charge is going to be attracted to the negative charge and Likewise the negative charge will be attracted to the positive charge and they'll form what we call an ionic bond this Attraction between these two particles to cancel out that pull charge on either one of those particles So what will happen is? those two will come together and make the compound Lithium fluoride that's how to show the entire reaction between lithium and fluorine to Make lithium fluoride. So you start with the elements. They're loose dodge structures You show the transfer of the one electron So this is the one electron transfer We want to put that that's fine That makes the two ions They come together to cancel out each other charge to make lithium fluoride