the periodic table

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Across
  1. 3. transition metals,period4,column9
  2. 4. Au
  3. 6. named after a planet
  4. 8. laughing gas
  5. 9. Pb
Down
  1. 1. atomic number 12
  2. 2. Na
  3. 3. good for bones
  4. 5. group6,period2,column16
  5. 7. Ag