Periodic Table Challenge 1

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Across
  1. 3. Maximum number of electrons in the second energy shell
  2. 4. Which is more numerous metals or nonmetals?
  3. 5. This element has the symbol Cd
  4. 6. Atomic mass 131.29
  5. 10. This is the first element of the transitional metals
  6. 11. This doesn't react and is in period 3.
  7. 17. You put this in a pool to keep it clean
  8. 18. The series of extracted elements from period 6
  9. 19. This has 22 protons
  10. 20. The lightest non-metal
  11. 22. The creator of the first periodic table of elements
  12. 23. Protons plus neutrons
  13. 28. Negatively charged part of an atom
  14. 29. Location of protons and neutrons in atoms
  15. 31. This element has 9 electrons
  16. 32. Lightest member of group 8
  17. 34. English word for Plumbum
  18. 36. Wound cleaner
  19. 37. Rotten egg smell
  20. 39. This element is period 4 group 4
  21. 40. This element has the symbol Hg
Down
  1. 1. The number of periods in the periodic table
  2. 2. This has symbol Al
  3. 4. This has two more protons than Vanadium
  4. 7. It's what we breath
  5. 8. Two more protons than Cadmium
  6. 9. Something our bones contain
  7. 10. The symbol is Na
  8. 12. This is the name of the 5cent coin in the USA
  9. 13. This element is period 5 group 8
  10. 14. It's symbol is Au
  11. 15. This element has 78 electrons
  12. 16. Positively charged part of an atom
  13. 21. This element is located in period 4 and group 5
  14. 24. Maximum number of electrons in the first energy shell
  15. 25. This element has 49 protons
  16. 26. Rows in the periodic table are called
  17. 27. This has symbol K
  18. 30. This is below carbon in the periodic table
  19. 33. It's in a battery and in group 1
  20. 35. Lightest element
  21. 38. Superman's weakness
  22. 39. Vertical columns in the periodic table are called