Question

What is the difference between the atomic number and the mass number of an element?

Answer 1

Mass number is the number of protons and neutrons in an atom, and it tells us about the mass of the atom in amu, or atomic mass units. Atomic mass is the average mass of all the isotopes of a certain type. It is a weighted average that takes into account the abundances of all of the different isotopes

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Answer 2

Atomic mass is also known as atomic weight. The mass number is a count of the total number of protons and neutrons in an atom's nucleus.