The Periodic Table

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Across
  1. 3. this element is the lightest on the periodic table
  2. 4. the atomic number of carbon
  3. 6. this unique number represents the total # of protons
  4. 7. heavier positively charged particles found in the nucleus of an atom
  5. 8. the organizer of the periodic table
  6. 10. this element is the lightest noble gas
  7. 11. this element has 12 protons in its nucleus
  8. 12. electrically neutral particles found in the nucleus of an atom
  9. 13. vertical columns of the periodic table
Down
  1. 1. horizontal rows of the periodic table
  2. 2. this element has an atomic number of 18
  3. 4. this one or two letter abbreviation represents an element
  4. 5. this decimal represents the sum of the protons + the neutrons
  5. 9. light, negatively charged particles which circulate outside the nucleus