The Structure of the Atom

• • The atom is structured with a nucleus surrounded with electrons
  • The nucleus contains protons and neutrons
• • Protons have a mass of 1 and a charge of +1
  • Neutrons have a mass of 1 and a charge of 0
  • Electrons have a very small mass and a charge of - 1
• _ - > mass number = number of protons/neutrons

  Na

  _ - > atomic number = number of protons