Periodic Table

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Across
  1. 2. Has a mass number of 178
  2. 3. Has a mass number of 115
  3. 4. Has a mass number of 4
  4. 6. Has a mass number of 85
  5. 8. Has a mass number of 35
  6. 9. Has a mass number of 190
  7. 10. Has a mass number of 201
Down
  1. 1. Has a mass number of 58
  2. 5. Has a mass number of 262
  3. 7. Has a mass number of 28