Alpha, beta particles and gamma rays. How does the atomic number and atomic mass number change when a radioisotope decays to produce alpha beta or gamma radiation.

Answer 1

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)