This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Atom.svg semiaccurate depiction of the en helium atom The darkness of the en electron cloud corresponds to the lineofsight integral over the en probability function of the en electron orbital The magnified nucleus is schematic showing en protons in red and neutrons in en blue In reality the nucleus is also spherically symmetric en