Chemistry

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Across
  1. 3. the non-metal which forms the main part of living organisms
  2. 6. the particle with no charge which is found in atoms
  3. 7. another name for group 7 elements
  4. 10. the only non-metal in liquid form
  5. 11. an element the compound of which is part of sand
  6. 15. the only metal in liquid form
  7. 16. metal which helps to make healthy teeth and bones
  8. 18. gas which makes up 78% of Earth's atmosphere
  9. 19. metal with a radioactive isotope
Down
  1. 1. an element with the lightest atomic mass
  2. 2. the metal used to make electric wiring
  3. 4. metal which is used to make steel
  4. 5. metal used to make airplane bodies
  5. 8. most reactive metal in the Periodic table
  6. 9. the lightest noble gas
  7. 11. metal which is part of cooking salt
  8. 12. the negatively charges particle found in atoms
  9. 13. gas used for respiration
  10. 14. the noble gas used to fill light bulbs
  11. 17. the element needed to make chlorophyll in green plants