Question

Atomic mass vs mass number?

Answer 1

Atomic mass is also known asatomic weight. Atomic mass is the weighted average mass of anatom of an element based on the relative natural abundance of that element's isotopes. The mass number is a count of the totalnumber of protons and neutrons in an atom's nucleus.

Answer 2

The mass number is the number of nucleons (protons and neutrons) in the nucleus of an atom.
For example 126C612C has a mass number of 1212 as it has 66 protons and 66neutrons in its nucleus and 3517Cl1735Cl has a mass number of 3535 as it has 1717protons and 1818 neutrons in its nucleus. I hope i help you