Structure of an Atom

• Smallest particle of an element
• Different elements have different types of atoms
• Proton = positively charges (+ve)
• Electron = negative charged (-ve)
• Neutron = neutral (no charge)
• Electron shells = path where electrons orbit
• protons and neutrons are much heavier and have a relative atomic mass of electrons
• protons and neutrons are much heavier and have a relative atomic mass of electrons
• Electrons are very light
• Most alpha particles past through the gold foil

  => most atom is empty space
• Some bounces back, dense nucleus at the center

  => nucleus is small and dense
• Hit the dense nucleus at the center

  => repell because nucleus have positive charge