Periodic Table Crosswrod

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Across
  1. 2. Number of groups in the periodic table
  2. 3. One thing groups are categorized in
  3. 5. Least reactive family in the periodic table
  4. 7. Assigned by the number of electron levels
  5. 9. The number of protons and neutrons added
  6. 12. Greek scientist who discovered atoms
  7. 14. The side metals are found on
  8. 15. Number of electron levels in period six
  9. 17. Amount of neutrons if atomic mass is 1, and there is 1 proton
  10. 18. The element with the symbol K
  11. 20. Pure substance made up of 1 type of atom
Down
  1. 1. The elements found by the step-like line
  2. 4. Number of periods in the periodic table
  3. 6. The number of protons and electrons
  4. 8. True/False: There is an element without a proton
  5. 10. What causes silver to slowly turn brown
  6. 11. One of the most reactive families/groups
  7. 13. The side non-metals are found on
  8. 16. Element found in same group as gold and silver
  9. 19. amount of neutrons if atomic number is 21 and atomic mass is 45