The Atom

  • The particles of the nucleus are held together by a force called the strong nuclear force.
  • The nucleus is made from particles called protons and neutrons which are made of even smaller particles called quarks.
  • Electrons are held to the  nucleus by electrical charge because they have an opposite electrical charge to the protons in the nucleus. 
  • Electrons behave as if they were stacked arround the nucleus in different levels called shells.
  • There is a certain number of electrons in each shell.