A.7次α和4次β
B.7次α和6次β
C.9次α和7次β
D.9次α和6次β
[单选题]U系,又称4n+2系,238U经过()衰变形成稳定核素206Pb。A.8次α和3次βB.8次α和6次βC.9次α和2次βD.9次α和5次β
[单选题]U系经过9次α衰变和6次β衰变形成稳定核素()。A.206PbB.207PbC.208PbD.209Pb
[单选题]U系,又称4n+2系,238U经过9次α衰变,7次β衰变形成稳定核素()。A.206PbB.207PbC.208PbD.209Pb
[单选题]1166.238U系,又称4n+2系,238U经过()次α衰变和()次β衰变,最后形成稳定核素206Pb。A.74B.97C.96D.95
[单选题]1169.23?系,又称4n+3系,235U经过()次ct衰变和()次p衰变,最后形成稳定核素2Q7Pb。A.74B.97C.96D.95
[单选题]铀系从23892U开始,经过连续()次衰变,最后达到稳定核素20692Pb。A.10B.11C.12D.14
[单选题]Th系,又称4n系,232Th经过()衰变,最后形成稳定核素208Pb。A.6次α和4次βB.7次α和4次βC.8次α和5次βD.9次α和5次β
[单选题]锕-铀系从23592U开始,经过连续()次衰变,最后达到稳定核素20792Pb。A.10B.11C.12D.14
[单选题]1168.235U系,又称4n+3系,235U经过9次α衰变和6次β衰变,最后形成稳定核素()。A.206PbB.207PbC.208PbD.209P
[单选题]1165.238U系,又称4n+2系,238U经过9次α衰变和7次β衰变,最后形成稳定核素()。A.206PbB.207PbC.208PbD.209P