Question

A nucleus decays by $\beta^{+}$ emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively.

• A. $Z - 1$ and $A - 1$
• B. $Z + 1$ and $A$
• C. $Z - 1$ and $A$
• D. $Z + 1$ and $A - 1$

Answer 1

Answer: (C)

$Z - 1$ and $A$

Answer 2

After $\beta^{+}(_{+ 1}e^{0})$ emission atomic number decreases by one and mass number remain unchanged. γ-emission, there will be no change on mass number and atomic number.