Question

Short note on mass number. ​

Answer 1

Mass number :-

▪ Mass number is an integer (whole number) equal to the sum of the number of protons and neutrons of an atomic nucleus.

▪ In other words, it is the sum of the number of nucleons in an atom.

▪Mass number is often denoted using a capital letter A.

▪ Contrast this with the atomic number, which is simply the number of protons.