20 elements of a periodic table

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Across
  1. 2. K on the periodic table
  2. 7. what we breathe
  3. 8. atomic mass 32.1
  4. 10. atomic number is 12
  5. 11. atomic mass 10.811
  6. 12. 14 electrons
  7. 14. P on the periodic table
  8. 15. N on the periodic table
  9. 16. Li on the periodic table
  10. 18. atomic mass 20.2
  11. 19. 9 protons
Down
  1. 1. 18 electrons
  2. 3. what salt is composed of
  3. 4. 6 protons,6 neutrons and 6 electrons
  4. 5. Al on the periodic table
  5. 6. number 1 on the atomic scale
  6. 9. milk has this element
  7. 11. Be on the periodic table
  8. 13. what we have in some pools
  9. 17. has 2 protons