Atom

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Across
  1. 4. something that cannot be divided
  2. 6. furthest inside or nearest to the centre
  3. 9. a substance, particle
  4. 14. laber, mark
  5. 15. the central part of an atom
  6. 16. furthest from the middle
  7. 17. difference, divergence, disagreement
  8. 18. a particle with a positive electrical charge
Down
  1. 1. nuclear
  2. 2. distance from the centre to the edge of a circle
  3. 3. change
  4. 5. previously
  5. 7. a part of an atom with no electrical charge
  6. 8. neutral, without charge
  7. 10. for this reason, thus, therefore
  8. 11. the lightest gase, combines with oxygen into water
  9. 12. concerning, as to, related to, with respect to
  10. 13. a particle with a negative electrical charge