Periodic Table Challenge Crossword Puzzle

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Across
  1. 2. Good conductors of electricity, malleable and ductile, usually solid
  2. 5. Most awesome teacher who taught us everything we need to know about the Periodic Table of Elements and more.
  3. 6. Neutrally charged elementary particle
  4. 8. Family of metals located in Group 2 of the Periodic Table
  5. 11. A man who discovered patterns in properties of elements
  6. 15. Number of elements in the Periodic Table
  7. 18. Another name for "Shell", where electrons are located
  8. 19. Column in the Periodic Table
  9. 20. Sort of abbreviation for the name of an element
  10. 21. Sometimes good conductors of heat, luster, malleability, and ductile varies
Down
  1. 1. Negatively charged elementary particle
  2. 3. Family of metals located in Group 1 of the Periodic Table
  3. 4. Dull, brittle, poor conductor of heat, often a gas
  4. 7. Electrons located on the outer-most energy level of the element's atomic model
  5. 9. The ______ ______ is equal to the number of protons or electrons the element has
  6. 10. Metals located in groups 3-12 on the Periodic Table
  7. 12. Positively charged elementary particle
  8. 13. Row in the Periodic Table
  9. 14. Family of gases located in Group 18 of the Periodic Table
  10. 16. There are 110 _______ in the Periodic Table
  11. 17. Family located in Group 17 of the Periodic Table