Physical Science 6.3 Review

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Across
  1. 3. the 1986 accident at a nuclear plant occurred in________
  2. 4. this type of decay occurs when an unstable atom ejects a clump of two protons and two neutrons
  3. 7. this word means division
  4. 8. when an atomic nucleus breaks up or undergoes a change, it gives off______
  5. 10. in this type of decay, an excited nucleus releases energy without a change in the number of protons or neutrons
  6. 12. this bomb uses nuclear fusion
  7. 13. any substance that is unstable is________
  8. 14. a device that initiates an uncontrolled chain reaction
Down
  1. 1. the process of combining two nuclei to form a heavier nucleus and releasing energy
  2. 2. the process of sterilizing food by exposing them to gamma rays
  3. 5. a certain amount of fissionable material that is present for a chain reaction to occur
  4. 6. another term for domino effect
  5. 8. the use of radioactive substances to diagnose or treat cancer and other diseases
  6. 9. this occurs when an atomic nucleus breaks up or changes, emitting radiation
  7. 11. this type of decay occurs when a neutron in an atom’s nucleus changes into a proton, emitting an electron
  8. 12. the decay rate of a substance