nuclear energy

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Across
  1. 3. the number that represents the elements place on the table
  2. 4. the process or result of joining two or more things together to form a single entity
  3. 7. lightest and most penetrating
  4. 8. a positive charged particle
  5. 10. the center of an atom
  6. 11. the act of emitting radiation spontaneously
  7. 13. the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
  8. 14. the weight of the element
Down
  1. 1. the time taken for the radioactivity of a specified isotope to fall to half its original value.
  2. 2. the action of dividing or splitting something into two or more parts.
  3. 5. a neutral charged particle
  4. 6. a chemical reaction or other process in which the products themselves promote or spread the reaction
  5. 9. middle weight and middle penetrating
  6. 12. heaviest and least penetrating