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The mass of $^{56} \mathrm{Fe}$ is $55.9349 \mathrm{u},$ and the mass of $^{56} \mathrm{Co}$ is

55.9399 u. Which isotope decays into the other and by what process?

\begin{array}{c}{56 \mathrm{Co} \rightarrow \mathrm{b} 6 \mathrm{Fe}+_{+1}^{0} \mathrm{e}+\nu_{\mathrm{c}}} \\ {+1}\end{array}

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from number 29. I'm asked by what process? These decay. Well, I can tell they have the same mass number, Um, 56. So it must be baited. Okay for sure. Um, and this one has more mass, so this must be the parent. So it's definitely gonna be 56. CEO is gonna break down into this 56 f e. All right, plus an electron. But I need to look up in the periodic table and check my, uh, my atomic numbers CEO is 27 f. He is 26 so this is actually one less so. This must be a positron. So this is a positive, baited decay.

University of Virginia