Problem: What radionuclide decays to Cs-133 by electron capture?

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We’re being asked to identify the original radionuclide that decays to Cs-133 by electron capture.

Heavy (large atomic mass) elements undergo radioactive reactions  (nuclear reactions) in order to increase the stability of their nuclei. 

In a radioactive capture or absorption reaction

radioactive particle is taken into the element
seen as a reactant

• An electron capture

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What radionuclide decays to Cs-133 by electron capture?

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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 Electron Capture concept. If you need more Electron Capture practice, you can also practice Electron Capture practice problems.

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Based on our data, we think this problem is relevant for Professor Deshmukh's class at UCSD.