periodic table crossword

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Across
  1. 3. The stronger the nuclear charge the ___ it pulls on electrons.
  2. 4. gases, Unreactive elements that have 8 valence electrons.
  3. 7. The innermost ring can only hold this amount of electrons.
  4. 9. This element is in row 4, column 3A or 13.
  5. 10. This element is in row 2, column 8A or 18.
  6. 12. Pattern of change.
  7. 13. a measure of whether or not atoms trade electrons with other atoms.
  8. 16. radius, References the physical size of an atom
  9. 17. Halogens are ___ physically.
  10. 20. Another name for a row
  11. 21. atom is seeking _____ valence electrons.
Down
  1. 1. Units for mass.
  2. 2. element in row 3 column 5A or 15.
  3. 5. In order to meet the octet rule, column 1A needs to add how many electrons?
  4. 6. Related to Effective Nuclear Charge
  5. 8. Metals, These metals are located in column ___.
  6. 11. affinity, How strong the atom pulls on electrons
  7. 14. a halogen in column 3A
  8. 15. electrons, Electrons on the outer-most shell.
  9. 18. When referring to the radius of an atom, bigger atoms are located on the ____ side of the periodic table.
  10. 19. Another name for Valence electrons.