Type the atomic number of the element by clicking the button type atomic number here. press space to start. press 9 to stop. press space and 9 at the same time to realign. press pick a random element to give you a number to type in. The nucleus is that of one that shows all the protons and neutrons, and also is the one of the most common isotope. Note that on oxygen the inner electrons touch the nucleus and on fluorine and neon. Also note that the electrons are much bigger and closer in the model than in a real atom. An electron would have a diameter 1/1000th of a proton.
I got the nucleuses from google.
