Module 4 Physical Science

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Across
  1. 2. nuclei the original unstable nuclei
  2. 3. nuclei the nuclei that remains after decay
  3. 5. same as a base
  4. 7. a material that donates a proton
  5. 8. dating using nuclear decay and half-life to determine the age of a substance
  6. 9. the reaction between an acid and a base
  7. 11. nucleus the same as an alpha particle
  8. 14. the process by which large isotopes are split into smaller isotopes and release energy
  9. 15. decay a process by which a neutron changes to a proton and emits an electron
  10. 18. the material needed to stop gamma decay
  11. 20. when an element changes to a different element through decay
  12. 21. a term used to describe the effect of acids
  13. 23. breaking into ions
Down
  1. 1. the emission of energy as electromagnetic waves or as moving subatomic particles
  2. 4. the time it takes for the amount of an unstable isotope to reduce to half its original amount
  3. 6. a material that accepts a proton
  4. 10. decay a process where an unstable nucleus changes by emitting a particle composed of two protons and two neutrons
  5. 12. a chemical used to determine the pH of a substance
  6. 13. decay the process by which an unstable nuclei emits energy
  7. 16. the process by which small isotopes are put together and release energy
  8. 17. the material needed to stop beta decay
  9. 19. the material needed to stop alpha decay
  10. 21. -14 the material used to date things that used to be living
  11. 22. different forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nucleus