A nuclide emits a beta-particle (e) in the process, that atomic number?

A. increases by 1 while the mass numer remains constant
B. decreases by 2 while the mass number remains constant
C. remains constant while the mass number decreases by 2
D. remains constant while the mass number increases by 1

Correct Answer: Option A

A. increases by 1 while the mass numer remains constant