Chemistry Crossword

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Across
  1. 4. poor conductors of heat, brittle
  2. 5. all have full outer shells
  3. 7. what is left after a reaction
  4. 8. Russian chemist that formulated periodic law
  5. 11. smallest piece of an atom in an element
  6. 12. have the same amount of shells
  7. 13. states that any matter can be changed but the mass will never change
  8. 16. cold reaction where energy is being absorbed
  9. 19. space outside the nucleus where electrons may exist
  10. 20. the mass of an atom
  11. 22. what we put into a reaction
  12. 23. reaction where a layer of metal is bonded to the surface of another substance
  13. 25. shorter name for an element
Down
  1. 1. pure substance that's made of 2 or more different kinds of atoms
  2. 2. particles with no charge
  3. 3. mix of metal and non metal
  4. 6. center of an atom
  5. 9. smallest particle in element or compound
  6. 10. electrons in the outermost orbital
  7. 14. how many protons and electrons an element has
  8. 15. negatively charged particles
  9. 17. hot reaction where energy is being released
  10. 18. pure substance that has one kind of atom
  11. 21. solid, shiny, good conductors of heat
  12. 23. positively charged particles
  13. 24. all have the same amount of valence electrons