Periodic Table

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Across
  1. 4. represents number of electron in each shell
  2. 7. outmost shell needs 8 electrons to be stable
  3. 9. neon, oxygen
  4. 10. negative ion
Down
  1. 1. not a metal or nonmetal, silicon
  2. 2. outmost shell electron
  3. 3. same row, horizontal
  4. 5. in the same column
  5. 6. positive ion
  6. 8. iron, gold, steel
  7. 11. molecule with a negative charge