A) \[\frac{Z-13}{(A-Z-23)}\]
B) \[\frac{Z-18}{(A-36)}\]
C) \[\frac{Z-13}{(A-36)}\]
D) \[\frac{Z-13}{(A-Z-13)}\]
Correct Answer: A
Solution :
\[_{z}{{X}^{A}}{{\xrightarrow{9\alpha }}_{Z-18}}{{X}^{A-36}}{{\xrightarrow{5\beta }}_{Z-13}}{{X}^{A-36}}\] Number of protons\[=(Z-13)\] Number of neutrons \[=(A-36)-(Z-13)=(A-Z-23)\] \[\therefore \] \[\frac{P}{N}=\frac{(Z-13)}{(A-Z-23)}\]
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