Question

Atomic mass of an element is the sum of number of ____________ and ___________.

• A. protons
• B. neutrons

Answer 1

Atomic mass: The number of protons and neutrons combine to give us the mass number of an atom. It is represented using the letter ‘$\mathrm{A}$.’ As both protons and neutrons are present in the nucleus of an atom, they are together called nucleons. For example, an atom of carbon has $6$ protons and $6$ neutrons. Thus, its mass number is $12$.

Hence, atomic mass of an element is the sum of number of protons and neutrons.