What nuclide is produced when a W-181 nucleus decays by electron capture?

Name: What nuclide is produced when a W-181 nucleus decays by electron capture?
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Question

Quizplus · Accepted Answer

When a nucleus undergoes electron capture, it captures an electron from the inner shell and combines it with a proton in the nucleus to form a neutron. The atomic number of the nucleus thus decreases by 1, but the mass number remains the same. In this case, W-181 captures an electron and becomes Re-181, thus the answer is B.

What Nuclide Is Produced When a W-181 Nucleus Decays by Electron