RADIOACTIVITY AND STABILITY OF ISOTOPES

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Across
  1. 4. Heavy, positively charged particles
  2. 10. Emission of radiation from unstable nuclei
  3. 11. Ability of a nucleus to remain unchanged
  4. 12. Ability to remove electrons from atoms
Down
  1. 1. Fast-moving electrons
  2. 2. Total number of protons and neutrons
  3. 3. High-energy electromagnetic waves
  4. 5. Splitting of heavy nuclei
  5. 6. Joining of light nuclei
  6. 7. Time for half of radioactive nuclei to decay
  7. 8. Atom with specific numbers of protons and neutrons
  8. 9. Device for detecting radiation