Question

Which isotope in each pair is more stable? Why?(a) ¹⁴⁰₅₅Cs or ¹³³₅₅Cs

Answer 1

Among ¹⁴⁰₅₅Cs and ¹³³₅₅Cs,  ¹³³₅₅Cs is more stable.

Briefly explained

Let's review the criteria that are used to determine a stable isotope. A stable isotope will have more neutrons than protons with a neutron to proton ratio somewhere between one and 1.52 On the high atomic number, we're up to 152 at low atomic numbers were closer to one. More stable isotopes have an even number of protons. And neutrons.

And stable isotopes have their proton or neutron number equal to one of these magic numbers. So if we have season one, It has 85 Protons are start 85 neutrons And 55 protons. So we have a neutron to proton ratio of 155 for CCM 1 33. We have 78 neutrons and 55 protons for a neutron to proton ratio of 1.42. 155 is a little high for z equal to 55.

Both of these are also odd. So ¹⁴⁰₅₅Cs is the least stable. ¹³³₅₅Cs is the most stable.

Learn more about stable isotopes

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