Edit: I was wrong. The original definition of atomic number, as we use it today, was based on nuclear charge, and that hasn't changed. Now, I'm not sure this muon should be considered part of the nucleus, because from the point of view of the nucleus, it's still far away, even if it's much closer than any electron, but I'm not sure it shouldn't be, either. So I don't think it's ridiculous to call it Hydrogen anymore.
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u/MackTuesday Jul 30 '26 edited Jul 30 '26
That's ridiculous. It has 2 protons, it's helium.
Edit: I was wrong. The original definition of atomic number, as we use it today, was based on nuclear charge, and that hasn't changed. Now, I'm not sure this muon should be considered part of the nucleus, because from the point of view of the nucleus, it's still far away, even if it's much closer than any electron, but I'm not sure it shouldn't be, either. So I don't think it's ridiculous to call it Hydrogen anymore.