The Nucleus

• Give an approximation for the radius of an atom.

  1 x 10 ^( - 10 )
• What proportion of the total radius of an atom is the radius of a nucleus?

  1 / 10,000
• How can an atom’s electron arrangement be changed?

  Absorbing or emitting electromagnetic radiation
• How does an atom’s electron arrangement change when it absorbs EM radiation?

  Electrons move to higher energy levels, they move away from the nucleus
• How does an atom‘s electron arrangement change when it emits EM radiation?

  Electrons move to a lower energy level, they move towards the nucleus