Atomic terms

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Across
  1. 2. anything that has mass and takes up space
  2. 4. element that is shiny
  3. 5. smallest unit of an element
  4. 7. negatively charged subatomic particle
  5. 8. any substance that can be separated using physical means
  6. 9. English physicist discovered the neutrons
  7. 12. subatomic particle with no charge
  8. 14. ion that has a negative charge
  9. 16. Greek Philosopher formulated an atomic theory
  10. 18. an atom that has the same number of protons
  11. 19. English physicist who justified physical laws
Down
  1. 1. English Chemist
  2. 2. sum of number of protons and neutrons
  3. 3. ion that has a positive charge
  4. 5. number of protons in the nucleus
  5. 6. element that conducts heat
  6. 7. electrons go around the nucleus of an atom
  7. 8. subatomic particle with positive charge
  8. 10. Father of nuclear physics
  9. 11. Danish physicist received Noble Prize in Physics
  10. 13. British scientist showed cathode rays
  11. 15. positively charged central region of an atom
  12. 17. a substance that cannot be broken down
  13. 18. an atom or molecule