Periodic Table

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Across
  1. 3. Heaviest element.
  2. 5. Right of stair step line.
  3. 9. The rows in the periodic table.
  4. 11. Most rare element.
  5. 14. Special element because it is on the left side of the stair step line.
  6. 17. The smallest particle of an element that retains the element properties.
  7. 18. An atom with a charge.
  8. 19. Along stair step line.
  9. 20. What does NaCl stand for?
  10. 21. Number of protons an atom has.
Down
  1. 1. Atoms of the same element that have different numbers or neutrons.
  2. 2. Only metal liquid at room temperature.
  3. 4. How many families are on the periodic table?
  4. 6. Creator of the table.
  5. 7. What does the element K stand for?
  6. 8. Sum of the protons and neutrons.
  7. 10. The columns that share chemical properties.
  8. 12. Number of man made elements.
  9. 13. Common model used to represent an atom.
  10. 15. Element that goes by Ds.
  11. 16. Elements found in nature.