First 20 Elements of the Periodic Table

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Across
  1. 3. Atomic mass of 20.2
  2. 5. "P" on the periodic table
  3. 8. Has 1 valence electron on the 2nd energy shell
  4. 11. Atomic number one
  5. 12. 14 electrons
  6. 14. What we have in some swimming pools
  7. 16. Milk has this element
  8. 18. Element symbol "Be"
  9. 19. Six protons, 6 neutrons, and 6 electrons
Down
  1. 1. Atomic mass of 32.1
  2. 2. Atomic mass of 10.8
  3. 4. The first element in table salt compound
  4. 5. K on the periodic table
  5. 6. 5th element of period 2
  6. 7. Atomic number is 12
  7. 9. 18 electrons
  8. 10. Touches the staircase, but is not a metalloid
  9. 13. What we breathe
  10. 15. Has two protons
  11. 17. 9 protons