CHEMISTRY

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Across
  1. 2. vertical column of elements
  2. 4. has more neutrons than protons
  3. 6. can increase reaction rate
  4. 8. uses symbols and numbers to represent a substance
  5. 11. interaction that holds atoms or ions together
  6. 14. smallest particle of an element
  7. 15. total number of protons and neutrons
  8. 16. poor conductor of heat and electricity
  9. 18. energy is released
  10. 19. able to form into shapes
  11. 20. metals can be made into wire
Down
  1. 1. group of atoms held together
  2. 3. formed in a reaction
  3. 5. the ability to burn
  4. 7. Mendeleev's arrangement of elements
  5. 9. energy is absorbed
  6. 10. identifies the atom
  7. 12. electrons on the outermost shell
  8. 13. participants in a reaction
  9. 17. has 80 protons
  10. 21. gains or loses electrons