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Ex. “This is an example of what type of nuclear reaction: 126/50 Sn -> 126/51 Sb”

I thought it was fusion since the atomic number increased, but it was actually beta- emission with a neutron turning into a proton and electron/e- neutrino pair.

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    $\begingroup$ The number of nucleons (neutrons + protons) remained the same. That is the key point that it is a beta (plus or minus) or electron capture reaction. $\endgroup$ Commented Sep 9, 2019 at 16:29
  • $\begingroup$ Seems like you should make this an answer $\endgroup$ Commented Sep 9, 2019 at 16:36
  • $\begingroup$ BTW, $\beta-$ emission emits an electron antineutrino, which conserves lepton number. $\endgroup$ Commented Sep 9, 2019 at 18:42
  • $\begingroup$ I've added the homework-and-exercises tag. In the future, please use this tag on this type of question. $\endgroup$ Commented Sep 9, 2019 at 21:27

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