The “stuff” or matter around us is all made up of atoms. Atoms have electrons (negative charge) and space around the nucleus. Inside the nucleus there are protons (positive charge), and nutrons (neutral charge). Nutrons separate the protons from other protons for like charges repell from each other. Now atoms are super small, it’s actually impossible to see them. Imagine this: you are in the year 2082 and you have a grapefruit in your hand. Now you have an inlarger ray and you enlarge your grapefruit to the size of the earth. Congratulations! How’s you can see atoms, but they are only the size of a blueberry, so you can’t quite see the nucleus, but you want to see it! So you take the enlarger ray and enlarge a blueberry to the size of a stadium. Now you can see the nucleus and it’s the size of a marble.