Chemistry Vocab (no spaces between words)

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Across
  1. 2. negatively charged particle
  2. 4. the table that contains an arrangement of all known elements
  3. 6. number of protons and electrons
  4. 9. average mass of all isotopes of that element
  5. 12. particle with no charge
  6. 13. diagram mental picture mathematical statement or an object that helps explain a concept
Down
  1. 1. one or two letter abbreviation for each element
  2. 3. very small center core of an atom
  3. 5. positive charged particle
  4. 7. sum of the protons and neutrons
  5. 8. the smallest unit of matter
  6. 10. horizontal rows in the periodic table
  7. 11. vertical columns in the periodic table
  8. 13. makes up everything in the universe