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What is the difference between atomic mass and atomic number?

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

There is a difference between the meanings of the chemistry terms atomic mass and mass number. One is the average weight of an element and the other is the total number of nucleons in the atom's nucleus. read more

The difference is that one is a count of the protons in an element’s nucleus while the other is a count of both the protons and neutrons. Atomic mass, also atomic weight, is the total weight of an element. read more

Atomic Number vs Mass Number Atoms are characterized by their atomic numbers and mass numbers. In the periodic table, atoms are arranged according to their atomic number. read more

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