Final Exam Extra Credit

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Across
  1. 2. one element that has different number of protons but same number of neutrons
  2. 5. E=hf
  3. 7. mass of element/molecular mass x 100
  4. 9. a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.
  5. 12. an emission spectrum consisting of separate isolated lines.
  6. 14. positively charged ion
  7. 16. 1.6022×10−13 J
  8. 17. negatively charged ion
  9. 21. The fundamental force of nature that holds protons and neutrons together in the atomic nucleus.
  10. 24. emittance of a helium nucleus in a form of radiation
  11. 25. when a substance emits alpha particles as radioactive decay
  12. 27. Hertz
  13. 28. neutrons and protons added together
  14. 31. subatomic particle that has no charge
  15. 33. an emission spectrum that consists of a continuum of wavelengths.
  16. 38. any of four independent sets of unstable heavy atomic nuclei that decay through a sequence of alpha and beta decays until a stable nucleus is achieved.
  17. 39. a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.
Down
  1. 1. ax10^b
  2. 3. number of neutrons and protons in the nucleus
  3. 4. attractive or repulsive forces between particles that are caused by their electric charges
  4. 6. the stability of elements determined by the ratio of the number of neutrons to the number of protons in the nucleus
  5. 8. the center of the atom
  6. 10. the substance that remains after water molecules are removed
  7. 11. wavelength=velocity/frequency
  8. 13. when a substance emits beta particles
  9. 15. the difference between the mass of an isotope and its mass number
  10. 18. positively charged subatomic particle
  11. 19. what emits during beta radiation
  12. 20. the minimum energy that is required to disassemble the nucleus of an atom into its constituent protons and neutrons, known collectively as nucleons.
  13. 22. Δm = [Z(mp + me) + (A – Z)mn] – matom
  14. 23. the range of wavelengths or frequencies over which electromagnetic radiation extends.
  15. 26. mass/total mass x 100
  16. 29. represents the reactants and products in radioactive decay, nuclear fission, or nuclear fusion
  17. 30. a particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
  18. 32. compound containing H2O molecules
  19. 34. red number on periodic table
  20. 35. decimal notation
  21. 36. radioactive decay with no charge
  22. 37. a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.
  23. 40. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons