Isotopes of francium
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Francium (Fr) has no stable isotopes. A standard atomic mass cannot be given. Its most stable isotope is 223Fr with a half-life of 22 minutes, occurring in trace quantities as an intermediate decay product of 235U. The other natural isotope is 221Fr.
Of elements whose most stable isotopes have been identified with certainty, Francium is the most unstable. All elements with atomic number of greater than or equal to 106 (Seaborgium) have most-stable-known isotopes shorter than that of Francium, but those elements have only a relatively small number of isotopes discovered, thus, there is the possibility of a yet-unknown isotope having a longer half-life.
Table
nuclide symbol |
historic name |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s)[1][n 1] |
daughter isotope(s) |
nuclear spin |
representative isotopic composition (mole fraction) |
range of natural variation (mole fraction) |
---|---|---|---|---|---|---|---|---|---|---|
excitation energy | ||||||||||
199Fr | 87 | 112 | 199.00726(4) | 16(7) ms | 1/2+# | |||||
200Fr | 87 | 113 | 200.00657(8) | 24(10) ms | α | 196At | 3+# | |||
200mFr | 60(110) keV | 650(210) ms | α | 196At | 10−# | |||||
IT (rare) | 200Fr | |||||||||
201Fr | 87 | 114 | 201.00386(8) | 67(3) ms | α (99%) | 197At | (9/2−) | |||
β+ (1%) | 201Rn | |||||||||
202Fr | 87 | 115 | 202.00337(5) | 290(30) ms | α (97%) | 198At | (3+) | |||
β+ (3%) | 202Rn | |||||||||
202mFr | 330(90)# keV | 340(40) ms | α (97%) | 198At | (10−) | |||||
β+ (3%) | 202Rn | |||||||||
203Fr | 87 | 116 | 203.000925(17) | 0.55(2) s | α (95%) | 199At | (9/2−)# | |||
β+ (5%) | 203Rn | |||||||||
204Fr | 87 | 117 | 204.000653(26) | 1.7(3) s | α (96%) | 200At | (3+) | |||
β+ (4%) | 204Rn | |||||||||
204m1Fr | 50(4) keV | 2.6(3) s | α (90%) | 200At | (7+) | |||||
β+ (10%) | 204Rn | |||||||||
204m2Fr | 326(4) keV | 1.7(6) s | (10−) | |||||||
205Fr | 87 | 118 | 204.998594(8) | 3.80(3) s | α (99%) | 201At | (9/2−) | |||
β+ (1%) | 205Rn | |||||||||
206Fr | 87 | 119 | 205.99867(3) | ~16 s | β+ (58%) | 206Rn | (2+,3+) | |||
α (42%) | 202At | |||||||||
206m1Fr | 190(40) keV | 15.9(1) s | (7+) | |||||||
206m2Fr | 730(40) keV | 700(100) ms | (10−) | |||||||
207Fr | 87 | 120 | 206.99695(5) | 14.8(1) s | α (95%) | 203At | 9/2− | |||
β+ (5%) | 207Rn | |||||||||
208Fr | 87 | 121 | 207.99714(5) | 59.1(3) s | α (90%) | 204At | 7+ | |||
β+ (10%) | 208Rn | |||||||||
209Fr | 87 | 122 | 208.995954(16) | 50.0(3) s | α (89%) | 205At | 9/2− | |||
β+ (11%) | 209Rn | |||||||||
210Fr | 87 | 123 | 209.996408(24) | 3.18(6) min | α (60%) | 206At | 6+ | |||
β+ (40%) | 210Rn | |||||||||
211Fr | 87 | 124 | 210.995537(23) | 3.10(2) min | α (80%) | 207At | 9/2− | |||
β+ (20%) | 211Rn | |||||||||
212Fr | 87 | 125 | 211.996202(28) | 20.0(6) min | β+ (57%) | 212Rn | 5+ | |||
α (43%) | 208At | |||||||||
213Fr | 87 | 126 | 212.996189(8) | 34.6(3) s | α (99.45%) | 209At | 9/2− | |||
β+ (.55%) | 213Rn | |||||||||
214Fr | 87 | 127 | 213.998971(9) | 5.0(2) ms | α | 210At | (1−) | |||
214m1Fr | 123(6) keV | 3.35(5) ms | α | 210At | (8−) | |||||
214m2Fr | 638(6) keV | 103(4) ns | (11+) | |||||||
214m3Fr | 6477+Y keV | 108(7) ns | (33+) | |||||||
215Fr | 87 | 128 | 215.000341(8) | 86(5) ns | α | 211At | 9/2− | |||
216Fr | 87 | 129 | 216.003198(15) | 0.70(2) µs | α | 212At | (1−) | |||
β+ (2×10−7%) | 216Rn | |||||||||
217Fr | 87 | 130 | 217.004632(7) | 16.8(19) µs | α | 213At | 9/2− | |||
218Fr | 87 | 131 | 218.007578(5) | 1.0(6) ms | α | 214At | 1− | |||
218m1Fr | 86(4) keV | 22.0(5) ms | α | 214At | ||||||
IT (rare) | 218Fr | |||||||||
218m2Fr | 200(150)# keV | high | ||||||||
219Fr | 87 | 132 | 219.009252(8) | 20(2) ms | α | 215At | 9/2− | |||
220Fr | 87 | 133 | 220.012327(4) | 27.4(3) s | α (99.65%) | 216At | 1+ | |||
β− (.35%) | 220Ra | |||||||||
221Fr | 87 | 134 | 221.014255(5) | 4.9(2) min | α (99.9%) | 217At | 5/2− | Trace[n 2] | ||
β− (.1%) | 221Ra | |||||||||
CD (8.79×10−11%) | 207Tl 14C |
|||||||||
222Fr | 87 | 135 | 222.017552(23) | 14.2(3) min | β− | 222Ra | 2− | |||
223Fr | Actinium K | 87 | 136 | 223.0197359(26) | 22.00(7) min | β− (99.99%) | 223Ra | 3/2(−) | Trace[n 3] | |
α (.006%) | 219At | |||||||||
224Fr | 87 | 137 | 224.02325(5) | 3.33(10) min | β− | 224Ra | 1− | |||
225Fr | 87 | 138 | 225.02557(3) | 4.0(2) min | β− | 225Ra | 3/2− | |||
226Fr | 87 | 139 | 226.02939(11) | 49(1) s | β− | 226Ra | 1− | |||
227Fr | 87 | 140 | 227.03184(11) | 2.47(3) min | β− | 227Ra | 1/2+ | |||
228Fr | 87 | 141 | 228.03573(22)# | 38(1) s | β− | 228Ra | 2− | |||
229Fr | 87 | 142 | 229.03845(4) | 50.2(4) s | β− | 229Ra | (1/2+)# | |||
230Fr | 87 | 143 | 230.04251(48)# | 19.1(5) s | β− | 230Ra | ||||
231Fr | 87 | 144 | 231.04544(50)# | 17.6(6) s | β− | 231Ra | (1/2+)# | |||
232Fr | 87 | 145 | 232.04977(69)# | 5(1) s | β− | 232Ra |
- ↑ Abbreviations:
CD: Cluster decay
IT: Isomeric transition - ↑ Intermediate decay product of 237Np
- ↑ Intermediate decay product of 235U
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 radon | Isotopes of francium | Isotopes of radium |
Table of nuclides |
Isotopes of the chemical elements | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 H |
2 He |
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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 |
|||