Question

what is mass number?​

Answer 1

Answer:

MASS NUMBER -

the total number of protons and neutrons in an atom

Answer 2

Answer:

Definition of mass number : an integer that approximates the mass of an isotope and designates the number of nucleons in the nucleus

EXPLANATION:

Mass Numbers of Atoms - Definition

Definition of Mass Numbers: All atoms have a mass number which is derived from calculating the sum of the total number of neutrons and protons in an atomic nucleus of a particular atom.

Mass Numbers = (Number of Protons) + (Number of Neutrons)