Periodic Table

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Across
  1. 2. group I metal
  2. 5. the vertical columns are called families or ...
  3. 7. the sum of the protons and neutrons is the ... number
  4. 8. nonmetals tend to form ... ions
  5. 9. inactive gases
  6. 10. most active nonmetals
  7. 12. the horizontal rows are called ...
  8. 13. most of the elements are ...
Down
  1. 1. group II metal
  2. 3. elements in the middle of the periodic table are the ... metals
  3. 4. metal tend to form ...
  4. 6. atomic number is the number of ..
  5. 11. the elements are arranged by atomic