IPC Unit 8

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Across
  1. 3. mass cannot be created or destroyed, only _______
  2. 5. objects stick together after collision
  3. 7. the big number that can change to balance equations
  4. 9. elements in the same period have the same number of energy _____
  5. 13. mass in motion
  6. 14. objects bounce off each other after collision
  7. 15. the rows on the periodic table
  8. 18. negatively charged particles
  9. 19. the columns on the periodic table
  10. 20. momentum must be ______ during a collision
  11. 21. particle of light given off by electrons
  12. 23. most reactive nonmetals
Down
  1. 1. electrons jump from different _______ levels to gain or emit photons
  2. 2. elements in the same group share similar _______
  3. 4. the state when electrons have energy
  4. 6. least reactive of all elements; noble gases
  5. 8. ________ spectra; created when electrons jump between energy levels
  6. 10. electrons electrons in outer shell; determine reactivity
  7. 11. model used to show protons, neutrons, and electrons
  8. 12. most reactive metals
  9. 15. positively charged particles
  10. 16. cannot be changed when balancing equations
  11. 17. particle with a neutral charge
  12. 19. the state when electrons do not have energy
  13. 22. the _______ of atoms must be the same on both sides of a chemical equation