Physics Revision

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Across
  1. 2. how many electrons can fit onto the first shell of an atom?
  2. 4. what is the charge of a proton?
  3. 8. what is the charge of an electron?
  4. 9. how many electrons can fit onto the second shell of an atom?
Down
  1. 1. what type of waves are sound waves?
  2. 2. what type of waves are electromagnetic waves?
  3. 3. the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.
  4. 5. the resistance that one surface or object encounters when moving over another.
  5. 6. the earth____ on its axis.
  6. 7. what is the charge of a neutron?