nuclear energy

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Across
  1. 1. positively charged central core of an atom, with protons and neutrons, nearly all of the mass
  2. 4. the amount of time it takes a substance to decay by half
  3. 7. nuclear reaction when a heavy nucleus splits randomly or collides with another particle, with a release of energy
  4. 8. fast moving electron emitted by radioactive decay of certain substances
  5. 9. stable subatomic particle in all nuclei with a positive electric charge
  6. 11. subatomic particle with a neutral charge and a mass almost equal to the protons
  7. 13. helium nucleus emitted by radioactive substances
  8. 14. number of protons in the nucleus, determines the place in the periodic table
Down
  1. 2. a chemical reaction or other process in which the products promote/spread the reaction, which may create the situation to increase drastically
  2. 3. the total number of protons and neutrons in the nucleus
  3. 5. process when two light atomic nuclei fuse together to combine a single heavy one, releasing lots of energy
  4. 6. an atom with the same number of protons but a different number of neutrons
  5. 10. emission of ionizing radiation or particles caused by spontaneous break up of atomic nuclei
  6. 12. form of electromagnetic radiation, most dangerous