Hhh

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Across
  1. 6. → what it's made of
  2. 9. → atoms joined
  3. 11. → no charge
  4. 13. → features/traits
  5. 15. → correctly
  6. 17. → across subjects
  7. 18. → substances combined
  8. 19. → surroundings
Down
  1. 1. → evidence-based
  2. 2. → find out
  3. 3. → force per area
  4. 4. → basic rules
  5. 5. → + charge
  6. 7. → has mass, takes space
  7. 8. study of substances pattern - repeated design
  8. 10. → pure substance
  9. 12. → ‹ new machines invention
  10. 14. → smallest unit
  11. 16. → test/try