Question

The mass number = A, atomic number = Z and number of neutrons (n=?) are related as:

• A. n =A - Z
• B. n =A + Z
• C. n =A x Z
• D. None of these

Answer 1

The correct option is A

n =A - Z

Explanation for correct Option:

(A) n =A - Z

Atomic number(Z) = Number of protons(p)

Mass number(A) = Number of neutrons(n) + Number of protons (Z)

Therefore the number of neutrons(n) can be calculated as n = A - Z

So, the correct answer is an option (A)