To?calculate?the?atomic mass?of a single?atom?of an element, add up the?mass?of protons and neutrons. Example: Find the?atomic mass?of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has anatomic?number of 6, which is its number of protons.
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Prithvi Raj Singh answered this
Atomic mass can be calculated in terms of adding number of protons and number and neutrons present inside the nucleus of an atom which is in turn expressed in atomic mass unit ( amu) .
