Question

For the isotope ${{}_{6}C}^{13}$, the number of neutrons is:

• A. $6$
• B. $7$
• C. $19$
• D. $13$

Answer 1

Answer: (B)

$7$

In this structure $6$ represents atomic number that is the number of electrons or the number of protons and $13$ represents the mass number (A). The number of neutrons (N) = mass number (A) − no. of electron or no. of proton. Hence $N=13-6=7$.