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And in the case of fusion: we have tritium + deuterium fusing to make helium + a neutron + energy. Doesn't that leave us with still 3 neutrons and 2 protons at the end, ie: the same at the start?
So, in the case of splitting a plutonium atom, what gets lost? Presumably electrons are not touched. So, do we lose protons or neutrons? That would determine the elements produced. I assume the resultant atoms would be in plasma form given the temperatures involved.