WI Japan had atomic bombs?

Japan had built huge hydroelectric facilities in Korea. Assume they build them earlier and use electrically powered Liquid Thermal Diffusion plants instead of the ridiculous steam powered version we tried. No problem from an industrial standpoint.
But where would they get the science? Finding fission earlier is possible. Histories of the discovery of fission are quite emphatic on that point, that it was literally by accident that fission was not discovered earlier.
Isotopes were discovered in 1922 by Aston (I think, I could google it if it was important), and perhaps the Japanese might want to run some isotope separation experiments using Hg because it is so easy to process.
 
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