Question

State whether the following statements are true or false.

The mass number of an element has specific units

• A. True
• B. False

Answer 1

The correct option is B False

Mass number(A): Mass number is the sum of the protons(p) and neutrons(n) present in the nucleus

• Atomic number (Z) = No. of protons(p) = No. of electrons(e) (in neutral atom)
• Mass number (A) = No. of protons(p) + No. of neutrons(n) = Atomic no. (Z) + No. of neutrons(n).
• The mass number of an element does not have specific units. It is measured in the atomic mass unit (a.m.u)

Therefore the given statement is false.