Question

Atomic mass number is same as _______.

• A. atomic number
• B. mass number
• C. formula mass number
• D. valency

Answer 1

Answer: (B)

mass number

The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. This is not the same as the atomic number (Z) which denotes the number of protons in a nucleus, and thus uniquely identifies an element.