If you are physically making one you would need to 1. Glue balls together to represent protons and neutrons. This is the nucleus. Try to arrange them in an alternating pattern. 2. Glue the nucleus to the center of the cardboard. 3. Determine how many rings you need for the electrons. Starting from the innermost ring, you can have up to two electrons in the first ring, up to eight in the second ring, up to 18 in the third ring and up to 32 in the fourth ring. 4. Glue the string around the nucleus to make the energy level rings. 5. Apply a few drops of glue to each ring. 6. Glue the electrons on the rings, spacing them evenly. Make sure you don’t exceed each rings maximum number of electrons. If you are trying to draw one then you could easily find one online