Chemistry Crossword

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Across
  1. 4. the spontaneous emission of alpha particles
  2. 6. fast-moving electrons emitted by a radioactive substance
  3. 9. Isotopes that have the same number of neutrons
  4. 10. Combining smaller nuclei into bigger nuclei
  5. 12. when a nuclide is produced in an excited state
  6. 14. the time it takes for half of the particles in a sample to decay
  7. 15. particle of ionizing radiation consisting of 2 protons and 2 neutrons
  8. 17. isotopes of the same mass
  9. 18. radioactive decay process where an element may decay to another element that may also be radioactive
  10. 19. electromagnetic radiation of very short wavelength
Down
  1. 1. Nucleus formed during the radioactive decay process
  2. 2. of a substance emitting particles and radiation and being unstable
  3. 3. The number of nucleons (P+N) of an atom
  4. 5. The same as the number of protons
  5. 7. spontaneous emission of beta particles
  6. 8. a tool used to measure the relative abundance of atoms and molecules
  7. 9. Atoms with the same proton number, but a different number of neutrons
  8. 11. of an atom, having a ratio of 1-1.5 of neutrons to protons
  9. 13. Change that leads to the degeneration of a substance
  10. 16. splitting nuclei into smaller nuclei