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Band of Stability quiz #1

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Terms in this set (10)

  • What does the band of stability for atomic nuclei refer to?
    The band of stability refers to the region on a graph of neutron number versus proton number where stable nuclei are found. Nuclei within this band have a neutron-to-proton ratio that allows them to be stable and not undergo radioactive decay.
  • What is the belt of stability in nuclear chemistry?
    The belt of stability, also called the band or valley of stability, is the area on a neutron vs. proton graph where stable isotopes exist. Nuclei outside this belt are unstable and tend to undergo radioactive decay to move toward stability.
  • What role do neutrons play in the stability of the atomic nucleus?
    Neutrons act as a glue to hold protons together in the nucleus, counteracting the repulsive forces between positively charged protons.
  • What are the two major forces acting within the atomic nucleus?
    The attractive strong nuclear force from neutrons holds the nucleus together, while the repulsive columbic force from protons tries to push it apart.
  • How does the neutron-to-proton ratio affect nuclear stability?
    A balanced neutron-to-proton ratio helps maintain nuclear stability; an imbalance can lead to radioactive decay.
  • What is the most stable neutron-to-proton ratio for elements with atomic numbers up to 20?
    For atomic numbers up to 20, the most stable neutron-to-proton ratio is 1.
  • Why do elements with atomic numbers greater than 83 lack stable isotopes?
    Elements with atomic numbers above 83 have nuclei that are too unstable to exist, so they undergo radioactive decay.
  • What type of radioactive decay can decrease the number of neutrons in a nucleus above the valley of stability?
    Neutron emission or beta emission can decrease the number of neutrons, moving the nucleus toward the valley of stability.
  • Which decay processes can increase the number of neutrons in a nucleus below the valley of stability?
    Positron emission and electron capture can increase the number of neutrons or decrease the number of protons in the nucleus.
  • What nuclear processes are common for very heavy elements in the top right corner of the stability graph?
    Alpha decay and spontaneous fission are common for very heavy elements with atomic masses above 200.