Question

In the $\beta -decay$ of a radioactive nucleus :

• A. The atomic number is decreased by one
• B. A neutron is changed into a proton
• C. A proton is changed into a neutron
• D. The mass number is unchanged

Answer 1

Answer: (B), (D)

The correct options are
B A neutron is changed into a proton
D The mass number is unchanged

In the $\beta -decay$ of a radioactive nucleus a neutron is changed into a proton and the mass number is unchanged.
Example ${}_{88}R{a}^{228}\stackrel{-\beta }{\to }{}_{89}A{c}^{228}$.