atomic mass

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Across
  1. 2. C (look at the periodic table)
  2. 5. Os (look at the periodic table)
  3. 7. Cu (look at the periodic table)
  4. 8. Sn (look at the periodic table)
Down
  1. 1. B (look at the periodic table)
  2. 3. mass of an atom
  3. 4. Au (look at the periodic table)
  4. 6. Fe (look at the periodic table)