Posted by Ryan on Monday, January 16, 2012 at 9:09am.
Better of you gave an answer for us to comment on.
Lets sat we have the decay of
uranium (mass=235, atomic number=92)
to
thorium (mass=231, atomic number=90)
plus
He nucleus(mass=4, atomic number=2)
Note that the mass number (235=231+4) and atomic number balances (92=90+2)
So I think you can say what the changes are?
You can do the same with beta decay, but use
electron (mass=0 atomic number=-1)
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