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i think it is a 4 unit math problem,lol

thank you very much...i got it!~~

pls help... 238 92U →234 90Th + 4 2He 〓a decay 234 90Th →234 91 Pa + 0 -1e 〓b decay 234 91Pa →234 92U + 0 -1e 〓b decay 234 92U →230 90Th + 4 2He 〓a decay ……（until n/p=1:1） how does the isotope get a new proton from b decay to increase the element number...