The Mass number is also called as atomic mass number or nucleon number. It is defined as the sum of protons and neutrons in an atomic nucleus of a particular atom. It determines the atomic mass of atoms.
Mass Numbers = (Number of Protons) + (Number of Neutrons)
The mass number is written either after the element name or as a superscript to the left of an elements symbol. For example, the most common isotope of carbon is carbon-12, or 12C, which has 6 protons and 6 neutrons.
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