Periodic Table Crossword

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Across
  1. 5. A nonmetal in Group 4A.
  2. 6. Neon has _____ valence electrons.
  3. 7. A nonmetal in Group 1.
  4. 8. An element in Period 4 and Group 10.
  5. 12. the element name for Mn.
  6. 14. An element in Period 4 and Group 1A.
  7. 15. How many energy shells does a Tc atom have?
  8. 16. the element name for Fe.
  9. 17. Helium has _____ valence electrons.
  10. 18. Elements in Group 18
  11. 20. A very expensive transition metal.
Down
  1. 1. A metalloid in Group 13.
  2. 2. Elements in Group 2
  3. 3. Elements in Group 1
  4. 4. He arranged the elements in the periodic table by increasing atomic mass.
  5. 9. An element in Period 4 and Group 1B.
  6. 10. Elements in Group 17
  7. 11. What is the name for the element on Period 2 that has similar properties to iodine?
  8. 13. He arranged the elements in the periodic table by increasing atomic number.
  9. 19. Oxygen has _____ valence electrons.