Question

the process in which one of an isotope's neutrons breaks down into a proton and an electron and the electron leaves the atom as a beta particle

Answer 1

your answer is... Beta decay.hope this helps 

Answer 2

The correct answer is:

Beta decay.

Explanation:

The proton stays in the nucleus and the electron breaks the atom with high energy, and we call it a beta particle. When a beta scrap is discharged from the nucleus the nucleus has one more proton and one less neutron. This means the atomic mass number persists fixed and the atomic number increases by 1.