Just how small are atoms? And what's inside them? The answers turn out to be astounding, even for those who think they know. This fast-paced animation uses s... Which subatomic particle has a negative charge, has the mass of less than 1 AMU, and is located in the electron cloud. Neutron Which subatomic particle has a natural charge, has the mass of 1 AMU, and is located in the nucleus.
Atoms are made up of three basic types of particle: protons, neutrons, and electrons. These particles (as well as other particles smaller than atoms) are known as subatomic particles. Two of the three types of basic particle in an atom are electrically charged. Most of an atom consists of empty space.