Question

what is meant by atomic mass number​

Answer 1

Answer:

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.

Answer 2

Atomic mass number is the total no of protons and neutrons within the nucleus of an atom and it is symbolically represented as ‘A’ . for e.g. atomic mass number of hydrogen is 1 but we also have its isotopes i.e. deuterium and tritium whose atomic mass number is 2 and 3 respectively.