Physical Science Unit 10

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Across
  1. 3. The spontaneous process of nuclei undergoing a change by the emitting particles or rays
  2. 7. Given under its symbol in the periodic table
  3. 8. Electrically neutral particles
  4. 11. Negatively charged subatomic particles
  5. 12. An isotope that undergoes spontaneous decay (disintegration)
  6. 13. Occurs when each fission event causes at least one or more fission events
  7. 14. Found inside the nucleus of an atom
  8. 17. The minimum amount of fissionable material necessary to sustain a chain reaction
  9. 18. The central core of an atom
  10. 20. The weighed average mass of an atom of the element in naturally occurring samples
  11. 21. The number of protons in the nucleus of an atom
  12. 22. In isotopic notation, symbolized by the letter Z
  13. 23. The short-range force of attraction that acts between two nucleons and holds the nucleus together
Down
  1. 1. A collective term for neutrons and protons
  2. 2. The total number of nucleons
  3. 4. Forms of nuclei of an element that have the same numbers of protons but differ in their numbers of neutrons
  4. 5. A procedure used to establish the age of ancient organic remains by measuring the amount of 14C in a sample
  5. 6. Particles coming from the nucleus that are not certain to be fundamental
  6. 9. The decrease in mass in a nuclear reaction
  7. 10. A substance in which all the atoms have the same number of protons
  8. 15. The number of protons plus neutrons in a nucleus
  9. 16. A high-temperature gas of free electrons and positively charged ions
  10. 19. The time it takes for half the nuclei in a given radioactive sample to decay