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Problem: Which nuclide in each pair would you expect to have the longer half-life?Cs-113 or Cs-125

FREE Expert Solution

We’re asked to determine which nuclide in the given pair is expected to have the longer half-life (more stable)

Recall that the stability of a nuclide (longer half-life) depends on the number of protons and neutrons:

  • If neutron-to-proton ratio is ~ 1  stable 
    • Nuclides with even numbers of both protons and neutrons are generally stable 
  • If neutron-to-proton ratio is less than or greater than 1 → unstable

Recall that: 

Atomic number, Z = # of protons = # of electrons

Atomic mass, A = # of neutrons + # of protons 

**also known as mass number (number beside an isotope)

For the given pair: Cs-113 and Cs-125

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Problem Details

Which nuclide in each pair would you expect to have the longer half-life?

Cs-113 or Cs-125

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