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Atomic number is the number of protons within the nucleus of the element.

Mass number is the total mass of the element (made from number of electrons, protons, and neutrons).

You can calculate the approximate mass of the element by multiplying the respective mass of each component by its corresponding amount.

However, there will be a discrepancy by the calculated amount and the real amount because some of the mass is converted into energy when the element is formed.

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16y ago

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