A Periodic Crossoword

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Across
  1. 3. What is a negative ion called?
  2. 4. all elements within the same group have the same number of electrons
  3. 5. What element has the chemical symbol Sn?
  4. 8. What are the big letters called that define an element?
  5. 11. A row of chemical elements.
  6. 12. What equals protons plus neutrons?
  7. 13. What is the atomic number of Iridium?
  8. 15. What are the electrons in the outermost energy level?
  9. 17. What periodic element has the chemical symbol, Hs?
  10. 18. What are groups 3-12 called?
  11. 20. Which group of elements is located at the very bottom of the periodic table?
Down
  1. 1. Which periodic element is located in energy level 6 in the 10th group?
  2. 2. What is the atomic number of Argon
  3. 6. A column of chemical elements.
  4. 7. What is the heaviest noble gas?
  5. 9. What is a positive ion called?
  6. 10. True or false, carbon has 3 valence electrons.
  7. 14. Name a metalloid in group 16?
  8. 16. Which group is Lithium apart of?
  9. 19. Which block includes groups 1 and 2?