Before revision: Some of these elements, notably bismuth (atomic number 83), thorium (atomic number 90), and uranium ( 92), have one or more isotopes with half-lives long enough to survive as remnants of the explosive stellar nucleosynthesis that produced the heavy metals before the formation of our Solar System.
After revision: atomic numberSome of these elements, notably bismuth (atomic number 83), thorium (atomic number 90), and uranium ( 92), have one or more isotopes with half-lives long enough to survive as remnants of the explosive stellar nucleosynthesis that produced the heavy metals before the formation of our Solar System.