How many isotopes of gold are there?

Isotopes of gold. Gold (Au) has one stable isotope, 197Au, and 18 radioisotopes, with 195Au being the most stable with a half-life of 186 days. Gold is currently considered the heaviest monoisotopic element (bismuth formerly held that distinction, but bismuth-209 has been found to be slightly radioactive). read more

There is only one stable isotope of gold found in nature, #""^"197""Au"#. However, there are four synthetic isotopes of gold that are radioactive: They are #""^"195""Au"#, #""^"196""Au"#, #""^"198""Au"#, and #""^"199""Au"#, with half-lives anywhere from 2.7 days to 186 days. read more

Gold (79 Au) has one stable isotope, 197 Au, and 36 radioisotopes, with 195 Au being the most stable with a half-life of 186 days. Gold is currently considered the heaviest monoisotopic element (bismuth formerly held that distinction, but bismuth-209 has been found to be slightly radioactive). read more

There is indeed only one stable isotope of gold. However there are at least 40 unstable isotopes that have been discovered. We have not discovered all of the radioactive isotopes yet. read more