Sub-atomic Particles

• Proton number


  • proton number or atomic number is the number of protons in an atom
• Nucleon number


  • nucleon number or mass number is the number of protons and neutrons in an atom
• Nuclide Notation


  • mass on top, proton below

  
• ion


  • formed when an atoms or a group of atoms loses or gains electrons
  • charge of an ion shows the number of electrons lost or gained
• Isotopes


  • atoms of the same element with the same proton number but different nucleon number
  • isotopes have similar chemical properties but different physical properties such as density, boiling point and melting point