SI Lecture 2

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Across
  1. 1. ******* shell; the outermost electron shell
  2. 3. anything that has mass and occupies space
  3. 7. a substance consisting of 2+bonded atoms
  4. 8. a positively-charged ion
  5. 10. a chemical that is not reactive; the valence shell is full
  6. 13. positively-charged subatomic particle
  7. 14. ****** number; the number of protons unique to that element
  8. 16. substance that cannot be broken down
  9. 17. capacity to cause change
  10. 18. a negatively-charged ion
Down
  1. 2. smallest unit of matter
  2. 4. the tendency of an atom to attract electrons
  3. 5. an atom (or group of atoms) that has gained or lost electron/s
  4. 6. negatively-charged subatomic particles
  5. 9. different atomic forms of the same element
  6. 11. neutrally-charged subatomic particle
  7. 12. **** number; the total number of protons and neutrons
  8. 15. a substance consisting of 2+ different elements