Английская Википедия:Isotopes of einsteinium
Шаблон:Short description Шаблон:Infobox einsteinium isotopes Einsteinium (99Es) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be discovered (in nuclear fallout from the Ivy Mike H-bomb test) was 253Es in 1952. There are 18 known radioisotopes from 240Es to 257Es, and 5 nuclear isomers. The longest-lived isotope is 252Es with a half-life of 471.7 days, or around 1.293 years.
List of isotopes
Шаблон:Isotopes table |- | rowspan=3|240Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 141 | rowspan=3|240.06895(39)# | rowspan=3|6.0(17) s | α (70%) | 236Bk | rowspan=3|4−# |- | β+ (30%) | 240Cf |- | β+, SF (0.16%) | (various) |- | rowspan=2|241Es[1] | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 142 | rowspan=2|241.06859(25)# | rowspan=2|Шаблон:Val | α | 237Bk | rowspan=2|3/2−# |- | β+? | 241Cf |- | rowspan=3|242Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 143 | rowspan=3|242.06957(28)# | rowspan=3|17.8(16) s | α (57%) | 238Bk | rowspan=3|2+# |- | β+ (43%) | 242Cf |- | β+, SF (0.6%) | (various) |- | rowspan=2|243Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 144 | rowspan=2|243.06951(22)# | rowspan=2|22.1(14) s | α (61%) | 239Bk | rowspan=2|(7/2+) |- | β+ (39%) | 243Cf |- | rowspan=3|244Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 145 | rowspan=3|244.07088(20)# | rowspan=3|37(4) s | β+ (95%) | 244Cf | rowspan=3|6+# |- | α (5%) | 240Bk |- | β+, SF (0.011%) | (various) |- | rowspan=2|245Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 146 | rowspan=2|245.07119(18)# | rowspan=2|1.11(6) min | β+ (51%) | 245Cf | rowspan=2|(3/2−) |- | α (49%) | 241Bk |- | rowspan=3 style="text-indent:1em" | 245m1Es | rowspan=3 colspan="3" style="text-indent:2em" | 30(15)# keV | rowspan=3|>50# us | IT? | 245Es | rowspan=3|7/2+# |- | α? | 241Bk |- | β+? | 245Cf |- | style="text-indent:1em" | 245m2Es | colspan="3" style="text-indent:2em" | 283(15)# keV | | IT | 245Es |(7/2−) |- | rowspan=3|246Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 147 | rowspan=3|246.072806(97) | rowspan=3|7.5(5) min | β+ (90.1%) | 246Cf | rowspan=3|4−# |- | α (9.9%) | 242Bk |- | β+, SF (.003%) | (various) |- | rowspan=3|247Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 148 | rowspan=3|247.073622(21) | rowspan=3|4.55(26) min | β+ (93%) | 247Cf | rowspan=3|(7/2+) |- | α (7%) | 243Bk |- | SF? | (various) |- | rowspan=3|248Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 149 | rowspan=3|248.075469(56)# | rowspan=3|24(3) min | β+ (99.75%) | 248Cf | rowspan=3|2−# |- | α (.25%) | 244Bk |- | β+, SF (3.5×10−4%) | (various) |- | rowspan=2|249Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 150 | rowspan=2|249.076409(32)# | rowspan=2|102.2(6) min | β+ (99.43%) | 249Cf | rowspan=2|7/2+ |- | α (.57%) | 245Bk |- | rowspan=2|250Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 151 | rowspan=2|250.07861(11)# | rowspan=2|8.6(1) h | β+ | 250Cf | rowspan=2|6(+) |- | α? | 246Bk |- | rowspan=2 style="text-indent:1em" | 250mEs | rowspan=2 colspan="3" style="text-indent:2em" | 200(150)# keV | rowspan=2|2.22(5) h | β+ | 250Cf | rowspan=2|1(−) |- | α? | 246Bk |- | rowspan=2|251Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 152 | rowspan=2|251.0799914(57) | rowspan=2|33(1) h | EC (99.5%) | 251Cf | rowspan=2|3/2− |- | α (.5%) | 247Bk |- | rowspan=2|252Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 153 | rowspan=2|252.082979(54) | rowspan=2|471.7(19) d | α (78(2)%) | 248Bk | rowspan=2|(4+) |- | EC (22(2)%) | 252Cf |- | rowspan=2|253Es[n 1] | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 154 | rowspan=2|253.0848212(13) | rowspan=2|20.47(3) d | α | 249Bk | rowspan=2|7/2+ |- | SF (8.7×10−6%) | (various) |- | rowspan=4|254Es | rowspan=4 style="text-align:right" | 99 | rowspan=4 style="text-align:right" | 155 | rowspan=4|254.0880243(32) | rowspan=4|275.7(5) d | α | 250Bk | rowspan=4|7+ |- | β− (1.74×10−4%) | 254Fm |- | SF (<3×10−6%) | (various) |- | EC? | 254Cf |- | rowspan=5 style="text-indent:1em" | 254mEs | rowspan=5 colspan="3" style="text-indent:2em" | 80.4(11) keV | rowspan=5|39.3(2) h | β− (98(2)%) | 254Fm | rowspan=5|2+ |- | IT (<3%) | 254Es |- | α (0.32(1)%) | 250Bk |- | EC (0.076(7)%) | 254Cf |- | SF (<0.045%) | (various) |- | rowspan=3|255Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 156 | rowspan=3|255.090274(12) | rowspan=3|39.8(12) d | β− (92.0%) | 255Fm | rowspan=3|(7/2+) |- | α (8.0%) | 251Bk |- | SF (.0041%) | (various) |- | rowspan=2 style="text-indent:1em" | 256Es | rowspan=2 style="text-align:right" | 99 |rowspan=2 style="text-align:right" | 157 |rowspan=2| 256.09360(11)# | rowspan=2|7.6 h | β− | 256Fm | rowspan=2|7+# |- | β−, SF (.002%) | (various) |- | 256mEs | colspan="3" style="text-indent:2em" | 0(100)# keV | 25.4(12) min | β− | 256Fm | 0+# |- | rowspan=2|257Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 158 | rowspan=2|257.09598(44)# | rowspan=2|7.7(2) d | β− | 257Fm | rowspan=2|7/2+# |- | α? | 253Bk Шаблон:Isotopes table/footer
References
- Isotope masses from:
- Half-life, spin, and isomer data selected from the following sources.
Шаблон:Navbox element isotopes
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