Delengen ing paragraf ing ngisor iki lan banjur wangsulana pitakonan ing basa sing padha karo paragraf: Passage: Nineteen nuclides and three nuclear isomers are known for einsteinium with atomic weights ranging from 240 to 258. All are radioactive and the most stable nuclide, 252Es, has a half-life of 471.7 days. Isotop paling stabil sabanjure yaiku 254Es (paruh umur 275.7 dina), 255Es (39.8 dina) lan 253Es (20.47 dina). Kabeh isotop sing isih ana duwe umur paruh luwih cendhek tinimbang 40 jam, lan sing paling akeh rusak kurang saka 30 menit. Saka telung isomer nuklir, sing paling stabil yaiku 254mEs kanthi umur paruh 39.3 jam. Pitakonan: Apa umur paruh 254mEs?
39.3 jam