Periodic Table Crossword!

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Across
  1. 2. Goes verticle on the periodic table.
  2. 6. Equals the number of protos and nuetrons.
  3. 7. Made the first know periodic table of elements.
  4. 8. Number of protons.
  5. 10. Variation of an element.
  6. 11. Unstable isotope.
  7. 12. Charge is Zero
  8. 14. Most malluable part of the periodic table.
  9. 15. Also known as metalloid
  10. 17. Charge is negative.
  11. 18. Number 1 on the periodic table.
  12. 19. Charge is positive.
Down
  1. 1. Model where electrons can be in only certain energy levels.
  2. 3. Goes horizontal on the periodic table.
  3. 4. The biggest category on the periodic table.
  4. 5. An electron that is found in the outermost part of an atom.
  5. 9. Sum of the number of protons and nuetrons.
  6. 13. States that the repeating chemical and physical properties change periodically.
  7. 16. Poor conductors of heat and electricity.