All substances are made of tiny particles of matter called atoms which are the building blocks of all matterEach atom is made of subatomic particles called protons, neutrons, and electrons
The protons and neutrons are located at the centre of the atom, which is called the nucleus
The electrons move very fast around the nucleus in orbital paths called shells
The mass of the electron is negligible, hence the mass of an atom is contained within the nucleus where the protons and neutrons are located