(B) Mass number $(A)$ is the sum of the number of protons $(p)$ and neutrons $(n)$ present in the nucleus.$A = n + p$Given: $A = 13$,$n = 7$.$p = A -

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(B) Mass number $(A)$ is the sum of the number of protons $(p)$ and neutrons $(n)$ present in the nucleus.$A = n + p$Given: $A = 13$,$n = 7$.$p = A - n = 13 - 7 = 6$.The atomic number $(Z)$ is equal to the number of protons $(p)$ in a neutral atom.Therefore,the atomic number is $6$.