Isotopes of einsteinium
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Einsteinium (Es) is a synthetic element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be discovered (in nuclear fallout from an H-bomb test) was 253Es in 1952. There are 19 known radioisotopes from 240Es to 258Es, and 3 nuclear isomers (250mEs, 254mEs, and 256mEs). The longest-lived isotope is 252Es with a half-life of 471.7 days, or around 1.293 years.
Table
| nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s)[1][n 1] |
daughter isotope(s) |
nuclear spin |
|---|---|---|---|---|---|---|---|
| excitation energy | |||||||
| 240Es | 99 | 141 | 240.06892(43)# | 1# s | α | 236Bk | |
| β+ (rare) | 240Cf | ||||||
| 241Es | 99 | 142 | 241.06854(24)# | 10(5) s [8(+6−5) s] |
α | 237Bk | (3/2−) |
| β+ (rare) | 241Cf | ||||||
| 242Es | 99 | 143 | 242.06975(35)# | 13.5(25) s | α (99.94%) | 238Bk | |
| β+, SF (.6%) | (various) | ||||||
| β+ (rare) | 242Cf | ||||||
| 243Es | 99 | 144 | 243.06955(25)# | 21(2) s | β+ (70%) | 243Cf | 3/2−# |
| α (30%) | 239Bk | ||||||
| 244Es | 99 | 145 | 244.07088(20)# | 37(4) s | β+ (94.69%) | 244Cf | |
| α (5.3%) | 240Bk | ||||||
| β+, SF (.01%) | (various) | ||||||
| 245Es | 99 | 146 | 245.07132(22)# | 1.1(1) min | β+ (60%) | 245Cf | (3/2−) |
| α (40%) | 241Bk | ||||||
| 246Es | 99 | 147 | 246.07290(24)# | 7.7(5) min | β+ (90.1%) | 246Cf | 4−# |
| α (9.9%) | 242Bk | ||||||
| β+, SF (.003%) | (various) | ||||||
| 247Es | 99 | 148 | 247.07366(3)# | 4.55(26) min | β+ (93%) | 247Cf | 7/2+# |
| α (7%) | 243Bk | ||||||
| SF (9×10−5%) | (various) | ||||||
| 248Es | 99 | 149 | 248.07547(6)# | 27(5) min | β+ (99.75%) | 248Cf | 2−#,0+# |
| α (.25%) | 244Bk | ||||||
| β+, SF (3×10−5%) | (various) | ||||||
| 249Es | 99 | 150 | 249.07641(3)# | 102.2(6) min | β+ (99.43%) | 249Cf | 7/2+ |
| α (.57%) | 245Bk | ||||||
| 250Es | 99 | 151 | 250.07861(11)# | 8.6(1) h | β+ (97%) | 250Cf | (6+) |
| α (3%) | 246Bk | ||||||
| 250mEs | 200(150)# keV | 2.22(5) h | EC (99%) | 250Cf | 1(−) | ||
| α (1%) | 246Bk | ||||||
| 251Es | 99 | 152 | 251.079992(7) | 33(1) h | EC (99.51%) | 251Cf | (3/2−) |
| α (.49%) | 247Bk | ||||||
| 252Es | 99 | 153 | 252.08298(5) | 471.7(19) d | α (76%) | 248Bk | (5−) |
| EC (24%) | 252Cf | ||||||
| β− (.01%) | 252Fm | ||||||
| 253Es[n 2] | 99 | 154 | 253.0848247(28) | 20.47(3) d | α | 249Bk | 7/2+ |
| SF (8.7×10−6%) | (various) | ||||||
| 254Es | 99 | 155 | 254.088022(5) | 275.7(5) d | α | 250Bk | (7+) |
| EC (10−4%) | 254Cf | ||||||
| SF (3×10−6%) | (various) | ||||||
| β− (1.74×10−6%) | 254Fm | ||||||
| 254mEs | 84.2(25) keV | 39.3(2) h | β− (98%) | 254Fm | 2+ | ||
| IT (3%) | 254Es | ||||||
| α (.33%) | 250Bk | ||||||
| EC (.078%) | 254Cf | ||||||
| SF (.0045%) | (various) | ||||||
| 255Es | 99 | 156 | 255.090273(12) | 39.8(12) d | β− (92%) | 255Fm | (7/2+) |
| α (8%) | 251Bk | ||||||
| SF (.0041%) | (various) | ||||||
| 256Es | 99 | 157 | 256.09360(11)# | 25.4(24) min | β− | 256Fm | (1+,0−) |
| 256mEs | 0(100)# keV | 7.6 h | β− (99.99%) | 256Fm | (8+) | ||
| β−, SF (.002%) | (various) | ||||||
| 257Es | 99 | 158 | 257.09598(44)# | 7.7(2) d | β− | 257Fm | 7/2+# |
| α | 253Bk | ||||||
| 258Es | 99 | 159 | 258.09952(32)# | 3# min | |||
- ↑ Abbreviations:
EC: Electron capture
IT: Isomeric transition
SF: Spontaneous fission - ↑ Most common isotope
Notes
- Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
- Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- Isotope masses from:
- Lua error in package.lua at line 80: module 'strict' not found.
- Isotopic compositions and standard atomic masses from:
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- Lua error in package.lua at line 80: module 'strict' not found.
- Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
- Lua error in package.lua at line 80: module 'strict' not found.
- Lua error in package.lua at line 80: module 'strict' not found.
- Lua error in package.lua at line 80: module 'strict' not found.
| Isotopes of californium | Isotopes of einsteinium | Isotopes of fermium |
| Table of nuclides | ||
| Isotopes of the chemical elements | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 H |
2 He |
||||||||||||||||
| 3 Li |
4 Be |
5 B |
6 C |
7 N |
8 O |
9 F |
10 Ne |
||||||||||
| 11 Na |
12 Mg |
13 Al |
14 Si |
15 P |
16 S |
17 Cl |
18 Ar |
||||||||||
| 19 K |
20 Ca |
21 Sc |
22 Ti |
23 V |
24 Cr |
25 Mn |
26 Fe |
27 Co |
28 Ni |
29 Cu |
30 Zn |
31 Ga |
32 Ge |
33 As |
34 Se |
35 Br |
36 Kr |
| 37 Rb |
38 Sr |
39 Y |
40 Zr |
41 Nb |
42 Mo |
43 Tc |
44 Ru |
45 Rh |
46 Pd |
47 Ag |
48 Cd |
49 In |
50 Sn |
51 Sb |
52 Te |
53 I |
54 Xe |
| 55 Cs |
56 Ba |
 |
72 Hf |
73 Ta |
74 W |
75 Re |
76 Os |
77 Ir |
78 Pt |
79 Au |
80 Hg |
81 Tl |
82 Pb |
83 Bi |
84 Po |
85 At |
86 Rn |
| 87 Fr |
88 Ra |
 |
104 Rf |
105 Db |
106 Sg |
107 Bh |
108 Hs |
109 Mt |
110 Ds |
111 Rg |
112 Cn |
113 Uut |
114 Fl |
115 Uup |
116 Lv |
117 Uus |
118 Uuo |
 |
57 La |
58 Ce |
59 Pr |
60 Nd |
61 Pm |
62 Sm |
63 Eu |
64 Gd |
65 Tb |
66 Dy |
67 Ho |
68 Er |
69 Tm |
70 Yb |
71 Lu |
||
|
89 Ac |
90 Th |
91 Pa |
92 U |
93 Np |
94 Pu |
95 Am |
96 Cm |
97 Bk |
98 Cf |
99 Es |
100 Fm |
101 Md |
102 No |
103 Lr |
||
