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:
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
Which nuclide in each pair would you expect to have the longer half-life?
Cs-113 or Cs-125
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Band of Stability concept. You can view video lessons to learn Band of Stability. Or if you need more Band of Stability practice, you can also practice Band of Stability practice problems.