Question

adf

Answer 1

An nucleus that undergoes alpha decay emits a Helium nucleus.

\[^{4} _{2} He\]

4 is the mass number (total neutrons and protons)
2 is the atomic number (total number of protons)

So you would subtract a Helium nucleus from whatever is undergoing decay to find out what happens to the proton-neutron ratio.

Answer 2

So I would take 2-4 and so the answer would be B @dimensionx