periodic table

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Across
  1. 4. a molecule made of two or more different elements
  2. 5. ag, 47
  3. 7. o, 8
Down
  1. 1. row 18
  2. 2. cu, 29
  3. 3. fe, 26
  4. 4. a vertical row of elements
  5. 6. ne, 10