Periodic Table Crossword

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Across
  1. 3. on the left side of the periodic table
  2. 4. Used in advertisement signs
  3. 6. Published the first periodic table in 1869; from Russia
  4. 8. The number of groups in the periodic table
  5. 9. Also known as families or the columns
  6. 10. Center of the atom where the most mass is
  7. 12. Positive charged particle located inside the nucleus
  8. 14. The number found in the top right corner on the periodic table
  9. 15. Element added to table salt
  10. 16. The ________ of the element increases from top to bottom on the periodic table
  11. 17. used to make balloons float
  12. 19. Negative charged particles located outside the nucleus
Down
  1. 1. The first element in the periodic table
  2. 2. Atom of the same element with a different number of neutrons
  3. 5. Used to graph the number of electrons on an element
  4. 7. Formal name for the rows
  5. 11. Used to clean things; usually swimming pools
  6. 13. Most soda cans are made from this element
  7. 14. Number of protons plus electrons
  8. 18. Elements used in fireworks