Hi, I'm Josh and this is a science classroom. In this video, we're going to talk about how to draw a board diagram. Here's the kind of question you would need to solve for your chemistry class. Draw a bore diagram for silicon. A bore diagram is a representation of electrons around the nucleus of an atom. It's based on the bore model of the atom. The bore model isn't the best representation, but it can at least give an approximation of how many electrons are in the outermost energy level known as the veence shell. First, we draw in the nucleus. The nucleus is where the protons and neutrons are located. I'm going to include these amounts in the nucleus. Not all chemistry teachers will require this information, but I always recommend you add it here. Silicon has 14 protons. I know that because its atomic number is 14. It also has 14 neutrons. I know that because I round the atomic weight to the nearest whole number. This represents the number of protons and neutrons added together. It's called the mass number. So if I subtract the number of protons from this mass number, then I know the number of neutrons. Now I can show all the electrons in the board diagram. The electrons are drawn as little circles on a ring. Each ring can hold a certain maximum number of electrons. The first ring can hold two and then each ring after that can hold eight. So let's start drawing in the 14 electrons for silicon. Here's the first ring. It can hold two electrons. I'll draw them like this. Then I'll draw another ring. This holds eight. It's usually good practice to draw them in pairs like this. So, I've drawn 10 electrons. There's just four left. So, I'll draw in one more ring and place the last four dots on this ring. I'm going to space them out on all four sides like this. You don't technically have to do this spacing, but it's kind of the best practice to give symmetry for the diagram. Now, to check our work, just count up all the dots. There's 14, and that matches the atomic number of silicon. Thanks for watching. If this video helped you out, please give it a like and subscribe to the channel.