Posted by J. J. on Friday, June 3, 2011 at 4:32pm.
Good grief. Thinbk about it.
If the atomic weight doesn't change, it can't be emitting an alpha particle. They have four nucleons in each one.
Instead, one of the neutrons in the U235 turns into an (emitted) electron or positron and a proton, with nearly zero mass change.
Now you figure out which it is. The atomic charge of the remaining nucleus must increase by 1.
Positron.
Anonymous: if you are trying to help, you aren't succeeding
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