Matches in DBpedia 2015-10 for { ?s ?p "Bismuth (Bi) has no stable isotopes, but does have one very long-lived isotope; thus, the standard atomic mass can be given. Although bismuth-209 is now known to be unstable, it has classically been considered to be a "stable" isotope because it has a half-life of over 1.9×1019 years, which is more than a billion (1000 million) times the age of the universe."@en }
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- Isotopes_of_bismuth comment "Bismuth (Bi) has no stable isotopes, but does have one very long-lived isotope; thus, the standard atomic mass can be given. Although bismuth-209 is now known to be unstable, it has classically been considered to be a "stable" isotope because it has a half-life of over 1.9×1019 years, which is more than a billion (1000 million) times the age of the universe.".