Electron Configuration

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Across
  1. 3. 2-1
  2. 5. 2-8-18-18-8-1
  3. 8. 2-2
  4. 10. 2-4
  5. 11. 2-8-8
  6. 13. 2-8-8-2
  7. 14. 2-8-18-2
  8. 15. 2-8
Down
  1. 1. 2-8-8-1
  2. 2. 2-8-7
  3. 4. 2-8-3
  4. 6. 2-8-6
  5. 7. 2-5
  6. 8. 2-3
  7. 9. 2-8-18-7
  8. 12. 2-6