Question

Number of neutrons in a parent nucleus $X$, which gives ${}_7^{14}N$ after two successive $\beta -emission$, would be -

• A. $6$
• B. $7$
• C. $8$
• D. $9$

Answer 1

The correct option is D $9$

${}_5^{14}X{\to }_7^{14}N+2_{-1}e$