Question

If A = Atomic mass, Z = Atomic number, then number of neutrons is equal to:

• A. $A-Z$
• B. $A+Z$
• C. $Z-A$
• D. $\frac{Z}{A}$

Answer 1

The correct option is A $A-Z$

If A = Atomic mass, Z = Atomic number then the number of neutrons is equal to:

$A$ = Atomic mass = Number of protons + Number of neutrons

$Z$ = Atomic Number = Number of protons

$A$ = $Z$ + Number of neutrons

Number of neutrons = $Z-A$