8

• Electron -> nucleus -> proton -> neutron
• Explain why the alpha particle takes the path it does.

  The alpha particle and the gold nucleus have the same charge so repel each other.
• Explain why the path of alpha particle B is more tightly curved than the path of alpha particle C.

  Particle B passes closer to the nucleus so experiences a stronger repulsive force.
• What can be deduced by the paths of D, E, F and G?

  The atom is mostly empty space.
• How is the Bohr model of the atom different from the nuclear model of the atom?

  Bohr model has specific distances of orbit.
• Explain how an electron can move up and down between energy levels in an atom.

  To move to a higher energy level an electron absorbs energy from electromagnetic radiation.

  To move to a lower energy level an electron emits energy in the form of electromagnetic radiation.