Periodic Table Crossword

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Across
  1. 1. sum of protons and neutrons are ____ number
  2. 3. group II metals
  3. 5. metals tend to form ______ ions
  4. 7. vertical columns are called families or ___
  5. 9. elements in the middle of the table __metals?
  6. 11. the elements are arranged by atomic number
  7. 12. most of the elements are
Down
  1. 1. group I Metals
  2. 2. most active non-metals
  3. 4. horizontal rows
  4. 6. the atomic number is the number of protons
  5. 8. non-metals tend to form _____ ions
  6. 10. inactive gases