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I just read this somewhereand I can't get my head around it. A first assumption was that nuclei were composed of A protons and Z - A electrons, so that the mass would be A·u and the charge Z·e, but this was uncompatible with Heisenberg’s Uncertainty relation (delta-p would be so big that the electron would be unbounded) and the nuclear spin of the deuteron (which was known to be I= 1·h instead of the values of ½ · h or 3/2·h this model gave)

How is the Uncertainty Relation uncompatible with the idea of a proton-electron nucleus?

And can you explain why this model predicted those values for the nuclear spin?

Thank you.

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# Older nuclear structure models.

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