Periodic Table Crossword Puzzle

1234567891011121314
Across
  1. 3. what the periodic table is named
  2. 6. the horizontal lines on the periodic table
  3. 8. what determines an elements neutrons
  4. 12. The amount of electrons on the last shell
  5. 13. the atomic mass of oxygen
  6. 14. Where the electrons are, just outside of the nucleus
Down
  1. 1. who created the periodic table
  2. 2. the least reactive of the elements
  3. 4. majority of the periodic table
  4. 5. The vertical lines on the periodic table
  5. 7. the most reactant halogen
  6. 9. the elements found on the staircase on the periodic table
  7. 10. what determines protons and electrons
  8. 11. what is the atomic symbol for Iron