Question

A mass number of an atom is equal to the:
(A) number of protons in the nucleus of the atom
(B) number of electrons and protons in the atom
(C) number of neutrons and protons in the nucleus of an atom
(D) number of neutrons in the nucleus of an atom

Answer 1

Answer-c

Explanation:

The mass number (symbol A, from the German word Atomgewicht (atomic weight)), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. ... The mass number is different for each different isotope of a chemical element.