Gold (Au) has a few naturally occurring isotopes, the most common of which is gold-197 (^197Au). This isotope is stable and makes up nearly all naturally occurring gold. Gold-197 has an atomic mass of approximately 196.96657 u. In addition to ^197Au, there are several radioactive isotopes of gold, though they are not found in nature and are typically produced in laboratories or through nuclear reactions.
Gold-198 (Au-198) is a radioactive isotope of gold. It has a mass number of 198, meaning it contains 118 neutrons and 79 protons in its nucleus. Au-198 is primarily produced through the neutron activation of gold-197, which is the most stable and abundant isotope of gold. **Key Characteristics of Gold-198:** 1.
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