Chemistry Bonus

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Across
  1. 2. brittle, poor conductor, dull
  2. 4. discovered the elctron
  3. 7. a reaction that releases heat and warms surroundings
  4. 8. discovered the nuetron
  5. 11. discovered the proton and nucleus
  6. 12. digits of a number used for accuracy starting with the first nonzero digit
  7. 15. a device used to measure calories
  8. 16. good conductor, malleable ,ductile,lustrous
  9. 17. a mixture where individual particles can't be distinguished
  10. 19. Silicon, Boron, Germanium, Arsenic, Antimony, Tellurium, Astatine, Polonium
  11. 20. how strongly atoms attract bonding electrons to themselves
Down
  1. 1. the temperature and pressure where a substance becomes a supercritical fluid
  2. 3. a reaction that absorbs heat and cools surroundings
  3. 5. metals tend to ____ electrons in chemical reactions
  4. 6. phase change from gas to solid
  5. 9. a mixture that isn't uniform
  6. 10. standard scientific unit of measurement
  7. 13. phase change from solid to gas
  8. 14. nonmetals tend to ____ electrons in chemical reactions
  9. 18. a mixture containing particles that settle out