Answer:
D) Isobars
Step-by-step explanation:
Isobars are atoms with the same mass number but different atomic numbers. When a radioactive nucleus emits a beta particle, it loses an electron, which has a negligible mass. Therefore, the mass number of the parent and daughter nuclei will be the same.
However, the atomic number of the daughter nucleus will be one greater than that of the parent nucleus, because the electron that was emitted was a product of a neutron decaying into a proton.
So the answer is (D).
