Periodic Table

12345678910111213141516171819
Across
  1. 4. = is a chemical element; it has symbol He and atomic number 2
  2. 8. = is a chemical element; it has symbol Ar and atomic number 18
  3. 10. = is a chemical element; it has symbol Cl and atomic number 17
  4. 12. = is a chemical element; it has symbol Si and atomic number 14
  5. 13. = is a chemical element; it has symbol S and atomic number 16
  6. 17. = is a chemical element; it has symbol N and atomic number 7.
  7. 18. = is a chemical element; it has symbol K and atomic number 19.
  8. 19. = is a chemical element; it has symbol He and atomic number 2.
Down
  1. 1. = is a chemical element; it has symbol Ca and atomic number 20
  2. 2. = is a chemical element; it has symbol Xe and atomic number 54
  3. 3. = is a chemical element; it has symbol Li and atomic number 3.
  4. 5. = is a chemical element; it has symbol Be and atomic number 4
  5. 6. = is a chemical element; it has symbol Mg and atomic number 12.
  6. 7. = is a chemical element; it has symbol O and atomic number 8
  7. 8. = is a chemical element; it has symbol Al and atomic number 13
  8. 9. = is a chemical element; it has symbol H and atomic number 1.
  9. 11. = is a chemical element; it has symbol B and atomic number 5.
  10. 14. = is a chemical element; it has symbol F and atomic number 9
  11. 15. = is a chemical element; it has symbol P and atomic number 15
  12. 16. = is a chemical element; it has symbol C and atomic number 6.