Matches in DBpedia 2016-04 for { ?s ?p "Berkelium (Bk) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 243Bk in 1949. There are 20 known radioisotopes, from 235Bk to 254Bk, and 6 nuclear isomers. The longest-lived isotope is 247Bk with a half-life of 1,380 years."@en }
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- Isotopes_of_berkelium abstract "Berkelium (Bk) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 243Bk in 1949. There are 20 known radioisotopes, from 235Bk to 254Bk, and 6 nuclear isomers. The longest-lived isotope is 247Bk with a half-life of 1,380 years.".
- Q221118 abstract "Berkelium (Bk) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 243Bk in 1949. There are 20 known radioisotopes, from 235Bk to 254Bk, and 6 nuclear isomers. The longest-lived isotope is 247Bk with a half-life of 1,380 years.".
- Isotopes_of_berkelium comment "Berkelium (Bk) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 243Bk in 1949. There are 20 known radioisotopes, from 235Bk to 254Bk, and 6 nuclear isomers. The longest-lived isotope is 247Bk with a half-life of 1,380 years.".
- Q221118 comment "Berkelium (Bk) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 243Bk in 1949. There are 20 known radioisotopes, from 235Bk to 254Bk, and 6 nuclear isomers. The longest-lived isotope is 247Bk with a half-life of 1,380 years.".