nuclear crosssword puzzle

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Across
  1. 1. positively charged atom that is in the nucleus.
  2. 5. Time taken for the radioactivity of a specified isotope to fall to half its original value.
  3. 7. A chemical reaction or other process in which the products themselves promote or spread the reaction.
  4. 8. negatively charged atom that is in the nucleus.
  5. 10. A helium nucleus emitted by some radioactive substances.
  6. 11. The number of protons in the nucleus of an atom, which determines the chemical properties .
  7. 13. central part of the atom that is positively charged.
  8. 14. equal numbers of protons but different numbers of neutrons in their nuclei.
Down
  1. 2. A nuclear reaction in which atomic nuclei of low atomic number.
  2. 3. A nuclear reaction in which a heavy nucleus splits spontaneously.
  3. 4. A form of electromagnetic radiation.
  4. 6. the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
  5. 9. A fast-moving electron emitted by radioactive decay of substances.
  6. 12. total number of protons and neutrons in a nucleus.