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Isotopes of mercury
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Main isotopes of mercury (80Hg)
Isotope
Decay
abundance
half-life (t1/2)
mode
product
194Hg
syn 444 y ε 194Au
195Hg
syn 9.9 h ε 195Au
196Hg
0.15% stable
197Hg
syn 64.14 h ε 197Au
198Hg
10.04% stable
199Hg
16.94% stable
200Hg
23.14% stable
201Hg
13.17% stable
202Hg
29.74% stable
203Hg
syn 46.612 d β− 203Tl
204Hg
6.82% stable
Standard atomic weight (Ar, standard)
200.592(3)[1]
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There are seven stable isotopes of mercury (80Hg) with 202Hg being the most abundant (29.86%). The longest-lived radioisotopes are 194Hg with a half-life of 444 years, and 203Hg with a half-life of 46.612 days. Most of the remaining 32 radioisotopes have half-lives that are less than a day. 199Hg and 201Hg are the most often studied NMR-active nuclei, having spins of 1/2 and 3/2 respectively.
180Hg, producible from 180Tl, was found in 2010 to be capable of an unusual form of spontaneous fission.[2] The fission products are 80Kr and 100Ru.
List of isotopes[edit]
nuclide
symbol
Z(p)
N(n)

isotopic mass (u)
half-life
decay
mode(s)[3][n 1]
daughter
isotope(s)[n 2]
nuclear
spin and
parity
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
171Hg 80 91 171.00376(32)# 80(30) µs
[59(+36−16) µs] 3/2−#
172Hg 80 92 171.99883(22) 420(240) µs
[0.25(+35−9) ms] 0
173Hg 80 93 172.99724(22)# 1.1(4) ms
[0.6(+5−2) ms] 3/2−#
174Hg 80 94 173.992864(21) 2.0(4) ms
[2.1(+18−7) ms] 0+
175Hg 80 95 174.99142(11) 10.8(4) ms α 171Pt 5/2−#
176Hg 80 96 175.987355(15) 20.4(15) ms α (98.6%) 172Pt 0+
β+ (1.4%) 176Au
177Hg 80 97 176.98628(8) 127.3(18) ms α (85%) 173Pt 5/2−#
β+ (15%) 177Au
178Hg 80 98 177.982483(14) 0.269(3) s α (70%) 174Pt 0+
β+ (30%) 178Au
179Hg 80 99 178.981834(29) 1.09(4) s α (53%) 175Pt 5/2−#
β+ (47%) 179Au
β+, p (.15%) 178Pt
180Hg[n 3] 80 100 179.978266(15) 2.58(1) s β+ (52%) 180Au 0+
α (48%) 176Pt
SF 100Ru, 80Kr
181Hg 80 101 180.977819(17) 3.6(1) s β+ (64%) 181Au 1/2(−)
α (36%) 177Pt
β+, p (.014%) 180Pt
β+, α (9×10−6%) 177Ir
181mHg 210(40)# keV 13/2+
182Hg 80 102 181.97469(1) 10.83(6) s β+ (84.8%) 182Au 0+
α (15.2%) 178Pt
β+, p (10−5%) 181Pt
183Hg 80 103 182.974450(9) 9.4(7) s β+ (74.5%) 183Au 1/2−
α (25.5%) 179Pt
β+, p (5.6×10−4%) 182Pt
183m1Hg 198(14) keV 13/2+#
183m2Hg 240(40)# keV 5# s β+ 183Au 13/2+#
184Hg 80 104 183.971713(11) 30.6(3) s β+ (98.89%) 184Au 0+
α (1.11%) 180Pt
185Hg 80 105 184.971899(17) 49.1(10) s β+ (94%) 185Au 1/2−
α (6%) 181Pt
185mHg 99.3(5) keV 21.6(15) s IT (54%) 185Hg 13/2+
β+ (46%) 185Au
α (.03%) 181Pt
186Hg 80 106 185.969362(12) 1.38(6) min β+ (99.92%) 186Au 0+
α (.016%) 182Pt
186mHg 2217.3(4) keV 82(5) µs (8−)
187Hg 80 107 186.969814(15) 1.9(3) min β+ 187Au 3/2−
α (1.2×10−4%) 183Pt
187mHg 59(16) keV 2.4(3) min β+ 187Au 13/2+
α (2.5×10−4%) 183Pt
188Hg 80 108 187.967577(12) 3.25(15) min β+ 188Au 0+
α (3.7×10−5%) 184Pt
188mHg 2724.3(4) keV 134(15) ns (12+)
189Hg 80 109 188.96819(4) 7.6(1) min β+ 189Au 3/2−
α (3×10−5%) 185Pt
189mHg 80(30) keV 8.6(1) min β+ 189Au 13/2+
α (3×10−5%) 185Pt
190Hg 80 110 189.966322(17) 20.0(5) min β+ 190Au 0+
α (5×10−5%) 186Pt
191Hg 80 111 190.967157(24) 49(10) min β+ 191Au 3/2(−)
191mHg 128(22) keV 50.8(15) min β+ 191Au 13/2+
192Hg 80 112 191.965634(17) 4.85(20) h EC 192Au 0+
α (4×10−6%) 188Pt
193Hg 80 113 192.966665(17) 3.80(15) h β+ 193Au 3/2−
193mHg 140.76(5) keV 11.8(2) h β+ (92.9%) 193Au 13/2+
IT (7.1%) 193Hg
194Hg 80 114 193.965439(13) 444(77) y EC 194Au 0+
195Hg 80 115 194.966720(25) 10.53(3) h β+ 195Au 1/2−
195mHg 176.07(4) keV 41.6(8) h IT (54.2%) 195Hg 13/2+
β+ (45.8%) 195Au
196Hg 80 116 195.965833(3) Observationally Stable[n 4] 0+ 0.0015(1)
197Hg 80 117 196.967213(3) 64.14(5) h EC 197Au 1/2−
197mHg 298.93(8) keV 23.8(1) h IT (91.4%) 197Hg 13/2+
EC (8.6%) 197Au
198Hg 80 118 197.9667690(4) Observationally Stable[n 5] 0+ 0.0997(20)
199Hg 80 119 198.9682799(4) Observationally Stable[n 6] 1/2− 0.1687(22)
199mHg 532.48(10) keV 42.66(8) min IT 199Hg 13/2+
200Hg 80 120 199.9683260(4) Observationally Stable[n 7] 0+ 0.2310(19)
201Hg 80 121 200.9703023(6) Observationally Stable[n 8] 3/2− 0.1318(9)
201mHg 766.22(15) keV 94(3) µs 13/2+
202Hg 80 122 201.9706430(6) Observationally Stable[n 9] 0+ 0.2986(26)
203Hg 80 123 202.9728725(18) 46.595(6) d β− 203Tl 5/2−
203mHg 933.14(23) keV 24(4) µs (13/2+)
204Hg 80 124 203.9734939(4) Observationally Stable[n 10] 0+ 0.0687(15)
205Hg 80 125 204.976073(4) 5.14(9) min β− 205Tl 1/2−
205mHg 1556.40(17) keV 1.09(4) ms IT 205Hg 13/2+
206Hg 80 126 205.977514(22) 8.15(10) min β− 206Tl 0+
207Hg 80 127 206.98259(16) 2.9(2) min β− 207Tl (9/2+)
208Hg 80 128 207.98594(32)# 42(5) min
[41(+5−4) min] β− 208Tl 0+
209Hg 80 129 208.99104(21)# 37(8) s 9/2+#
210Hg 80 130 209.99451(32)# 10# min
[>300 ns] 0+
Jump up ^ Abbreviations:
EC: Electron capture
IT: Isomeric transition
Jump up ^ Bold for stable isotopes
Jump up ^ When produced from 180Tl can also undergo fission to 100Ru and 80Kr
Jump up ^ Believed to undergo α decay to 192Pt or β+β+ decay to 196Pt with a half-life over 2.5×1018 years
Jump up ^ Believed to undergo α decay to 194Pt
Jump up ^ Believed to undergo α decay to 195Pt
Jump up ^ Believed to undergo α decay to 196Pt
Jump up ^ Believed to undergo α decay to 197Pt
Jump up ^ Believed to undergo α decay to 198Pt
Jump up ^ Believed to undergo α decay to 200Pt or β−β− decay to 204Pb
Notes[edit]
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[edit]
Jump up ^ Meija, J.; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
Jump up ^ Eugenie Samuel Reich (December 1, 2010). "Mercury serves up a nuclear surprise: a new type of fission". Scientific American.
Jump up ^ "Universal Nuclide Chart". nucleonica. (Registration required (help)).
Isotope masses from:
G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23.
Isotopic compositions and standard atomic masses from:
J. R. de Laeter; J. K. Böhlke; P. De Bièvre; H. Hidaka; H. S. Peiser; K. J. R. Rosman; P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051. Lay summary.
Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23.
National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005. Check date values in: |accessdate= (help)
N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0-8493-0485-9.
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Isotopes of the chemical elements
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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
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Cl 18
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Sr 39
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Mo 43
Tc 44
Ru 45
Rh 46
Pd 47
Ag 48
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Te 53
I 54
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La 72
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W 75
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At 86
Rn
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Ac 104
Rf 105
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Bh 108
Hs 109
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Ds 111
Rg 112
Cn 113
Nh 114
Fl 115
Mc 116
Lv 117
Ts 118
Og
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
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
Table of nuclides
Categories: Isotopes
Tables of nuclides
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Isotopes by element
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