An Atomic Number is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
A Mass number is the total number of protons and neutrons in a nucleus.
An Atomic Mass is the mass of a single atom of a chemical element. It includes the masses of the 3 subatomic particles that make up an atom: protons, neutrons and electrons.
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.
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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