What happens to the atomic mass number in a radioactive substance?

Answer 1

it decreases by half as it goes on.for example if the atomic mass number is 16 it decrease to 8 then to 4 then 2 and it goes on until it finishes

Answer 2

In a radioactive substance, the Atomic Mass number may change as a result of radioactive decay. During radioactive decay, radioactive atoms undergo nuclear reactions, which can lead to the emission of radioactive particles such as alpha or beta particles. These emitted particles can cause a change in the number of protons and neutrons in the nucleus, resulting in a different atomic mass number for the resulting atom or isotope.