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Across
  1. 5. Unpaired electrons present
  2. 7. Electron gaining energy
  3. 8. Region with zero electron probability
  4. 10. Electron releasing energy
Down
  1. 1. Mathematical function describing electron
  2. 2. All electrons paired
  3. 3. Particle of light
  4. 4. Study of light emitted by atoms
  5. 6. Repeating trends in the periodic table
  6. 9. Effective nuclear charge abbreviation