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Atomic mass is the number of protons present in the nucleus or number of electrons revolving around the nucleus in an atom .It is denoted by Z.

Mass number is the sum of number of protons and neutrons present in a nucleus in an atom .It is denoted by A.

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The Atomic Mass is the average mass of an atom of an element, taking into account all its isotopes and their relative abundance. The mass number, on the other hand, is the total number of protons and neutrons in the nucleus of an atom. Atomic mass is given in atomic mass units (amu), while mass number is a whole number.

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10mo ago
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Q: Atomic mass and mass number
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