Tirohia te whiti i raro nei, ka whakahoki i te pātai i muri i roto i te reo ano rite te whiti: Passage: Nineteen nuclides and three nuclear isomers are known for einsteinium with atomic weights ranging from 240 to 258. katoa he irirangi, me te nuclide pūmau rawa, 252Es, he hawhe-ora o 471.7 ra. Ko te isotopes tino pūmau i muri ko 254Es (hawhe hawhe-ora 275.7 ra), 255Es (39.8 ra) me 253Es (20.47 ra). katoa o te isotopes toe he hawhe-ora iti iho i te 40 haora, me te nuinga o ratou paheke i roto i iti iho i te 30 meneti. O te isomers karihi e toru, te tino pūmau ko 254mEs ki hawhe-ora o 39.3 haora. Pātai: He aha te hawhe ora o 254mEs?
39.3 haora