How is the atomic mass number of an isotope represented?

The atomic mass number of an isotope is represented as a superscript to the left of the chemical symbol. This notation reflects the total number of protons and neutrons in the nucleus of an atom, distinguishing one isotope of an element from another. For example, the notation for carbon-14 is (^{14}_{6}C), where 14 is the atomic mass number shown in superscript. This placement is important in scientific communication because it clearly indicates the mass number while keeping the standard format for writing chemical symbols. This convention helps in quickly identifying isotopes and understanding their properties in nuclear chemistry, physics, and related fields.