An electrical circuit allows electrons to flow from one side of the circuit to the other. The two ends of the circuit have a difference in electrical charge. One side is more positively charged than the other. Electrons are attracted to the positive side and...

Atoms and Matter All matter is made of atoms. Atoms are made up of tiny particles we call electrons, protons and neutrons. Protons and, usually, neutrons form the center (nucleus) of the atom. Electrons spin around the nucleus. All matter is made up of these few parts....