c11

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Across
  1. 2. Energy level of electrons
  2. 3. Group 17 nonmetals
  3. 7. Negative atomic particle
  4. 11. Positive charge particle
  5. 13. Electron path
  6. 14. Likely to decay
  7. 15. Not likely to change
Down
  1. 1. Time for half to decay
  2. 4. Unstable nucleus emitting radiation
  3. 5. Radioactive series
  4. 6. Metals in center of table
  5. 8. Rare earth series
  6. 9. Neutral atomic particle
  7. 10. Atomic core
  8. 12. Energy from unstable atoms