Periodic Table Crossword

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Across
  1. 3. Elements put below the Periodic Table
  2. 4. NiCl
  3. 9. Most reactive family
  4. 10. Atomic number for Barium
  5. 12. How many groups are on the Periodic Table
  6. 13. Arranged the Periodic Table how it is today
  7. 14. Neutral particles
  8. 16. Gas One of the five families on the Periodic Table
  9. 19. charge of +1
  10. 20. Not very accurate atom model
Down
  1. 1. Mr. Machu's favorite element
  2. 2. Along the stair step line
  3. 5. Has the chemical symbol C
  4. 6. The mass number for cobalt (rounded)
  5. 7. Nonmetal left of the stair step line
  6. 8. Negatively charged particles
  7. 11. made up of like atoms
  8. 15. Center of the atom
  9. 17. one of the smallest particles of an element
  10. 18. Atom model with electron rings