Chem unit 1

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Across
  1. 2. Decay Emission of a helium nucleus
  2. 5. Combining light nuclei to form a heavier one
  3. 6. Model Model showing electrons in fixed orbits
  4. 8. Number Number of protons in an atom
  5. 10. Radiation High-energy electromagnetic radiation
  6. 12. Neutral particle in the nucleus
  7. 13. Cloud Area around the nucleus containing electrons
  8. 16. Positively charged center of the atom
  9. 19. Decay Spontaneous breakdown of unstable nuclei
  10. 20. Splitting a heavy nucleus into lighter ones
Down
  1. 1. Time for half a radioactive sample to decay
  2. 3. Positively charged particle in the nucleus
  3. 4. Particle of electromagnetic radiation
  4. 7. Atoms with same protons but different neutrons
  5. 9. Smallest unit of an element
  6. 11. Atomic Mass Weighted average of all isotopes
  7. 14. Negatively charged particle outside the nucleus
  8. 15. Reaction Process changing the nucleus
  9. 17. Decay Conversion of a neutron to a proton and electron emission
  10. 18. Number Sum of protons and neutrons