Chemistry Crossword

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Across
  1. 4. A neutrally charged particle
  2. 5. A negatively charged particle
  3. 8. A positively charged particle
  4. 9. The table which contains all of the elements
  5. 10. The unit used to measure atomic weight
  6. 12. The number of protons in an element
Down
  1. 1. A negatively charged ion
  2. 2. A positively charged ion
  3. 3. An atom or molecule with a net charge
  4. 6. The atomic weight of an element
  5. 7. A particle with a nucleus and electrons
  6. 8. A line on the periodic table
  7. 11. A grouping of elements on the periodic table