Explanation: The atom is the smallest unit and most basic unit of matter. The atom is made up three subatomic particles and they are called the protons, neutrons, and electrons. The protons and neutrons are stored in the core of the atom and the electrons are located in the energy levels.
They are very small. Even smaller than atoms. Because atoms are the smallest that keep the composition but QUARKS are smaller, and DON'T keep their composition!!!!!!!!!!!!!
