Periodic table

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Across
  1. 3. the columns on the periodic table
  2. 7. the element with the symbol Au
  3. 9. the umber of neutrons in silver is____
  4. 10. the element with the atomic mass of 70/69.723
Down
  1. 1. the rows on the periodic table are called____
  2. 2. Sodium's atomic symbol is___
  3. 4. the element with the atomic number Cu
  4. 5. the number of protons in sulfur is____
  5. 6. the element with the atomic number 2
  6. 8. the element with the atomic number 27