Nuclear Radiation & Nuclear Transformations

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Across
  1. 1. The penetrating rays and particles emitted by radioactive source
  2. 3. Unstable nuclei undergo Spontaneous radioactive decay
  3. 4. Consists of fast moving electrons
  4. 6. Mass of an electron but a positive charge
  5. 7. Atmic # over 92
  6. 9. Materials give off such rays
  7. 10. Time required for one-half to decay to products
Down
  1. 1. The nuclei of unstable isotopes
  2. 2. Nucleus loses energy by emitting radiation
  3. 5. Consists of helium nuclei that have been emitted from a radioactive source
  4. 7. Discovery of neutrons
  5. 8. Atomic # lower by two and mass # lowers by four.