Periodic Table crossword

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Across
  1. 2. center of an atom
  2. 6. staircase on the periodic table
  3. 8. removing electrons
  4. 9. a bond formed when two atoms share valence electrons
  5. 12. number of protons in nucules
  6. 16. located in the outer most energy level
  7. 19. makes up periodic table
  8. 20. found in the middle of the periodic table
Down
  1. 1. forming a bond between other elements
  2. 3. a vertical column
  3. 4. a horizontal row
  4. 5. Negative charge
  5. 7. Neatral charge
  6. 10. brittle an poor conducters
  7. 11. nonreactive elements
  8. 13. same number of protons and electrons in a atom
  9. 14. an atom that has gained or lost electrons
  10. 15. Positive charge
  11. 17. the smallest part of an element
  12. 18. number one on the periodic table