Question

Atomic number (Z) of a neutral atom and mass number (A) of an atom are equal to:

(Here n = number of neutrons and p = number of protons):

• A. Z = n and A = n+p
• B. Z = e and A = n+e
• C. Z = p and A = n+p
• D. Z = n and A = p+e

Answer 1

Answer: (C)

Z = p and A = n+p

The atomic number = Z = no. of protons = p
The mass no. = A = no. of protons (p) + no. of neutrons(n) = n + p