# Keyword Analysis & Research: definition of the atomic mass number

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What is atomic mass and how is it determined?

The atomic mass of the atom is the mass of the protons plus the mass of the neutrons, 6 + 7, or 13. The atomic mass of an element is a weighted average of all the element's isotopes based on their natural abundance. It is simple to calculate the atomic mass of an element with these steps.

What does the term mean atomic number 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.

How do you calculate the mass of an atom?

The atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance. That is by adding together the number of protons and neutrons and multiplying by 1 amu (atomic mass unit), you can calculate the mass of the atom.