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