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