Answer and Explanation:
This is a model of an atom. Atoms are made up of three main parts: neutrons, protons, and electrons.
Neutrons are neutrally-charged subatomic particles, protons are positively-charged subatomic particles, and electrons are negatively-charged. Neutrons and protons are always located in the nucleus of the atom, which is basically the central location. Electrons, on the other hand, orbit all around this nucleus.
In the model, the protons and neutrons should be labelled in the center big golden ball, while the electron should be labelled on the small spheres "orbiting" this big center one. The electrons should also be labelled "negatively charged". Finally, the nucleus is positively charged because it's made up of protons (which are positive) and neutrons (which have no charge).
