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There are seven stable isotopes of mercury (Hg) with 202Hg being the most abundant (29.86%). The longest-lived radioisotopes are194Hg with a half-life of 444 years, and 203Hg with a half-life of 46.612 days. Most of the remaining radioisotopes have half-lives thatare less than a day. 199Hg and 201Hg are the most often studied NMR-active nuclei, having spins of 1/2 and 3/2 respectively.

Mercury-180, producible from thallium-180, was found in 2010 to be capable of an unusual form of spontaneous fission.[1] The fissionproducts are krypton-80 and ruthenium-100.

Standard atomic weight: 200.592(3) u

Table

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nuclidesymbol

Z(p) N(n)

isotopic mass (u) half-life

decaymode(s)[2][n 1]

daughterisotope(s)[n 2]

nuclearspin

representativeisotopic

composition(mole fraction)

range of naturalvariation

(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) msα (98.6%) 172Pt

0+β+ (1.4%) 176Au

177Hg 80 97 176.98628(8) 127.3(18) msα (85%) 173Pt

5/2-#β+ (15%) 177Au

178Hg 80 98 177.982483(14) 0.269(3) sα (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%) 177Ir181mHg 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%) 182Pt183m1Hg 198(14) keV 13/2+#183m2Hg 240(40)# keV 5# s β+ 183Au 13/2+#

184Hg 80 104 183.971713(11) 30.6(3) sβ+ (98.89%) 184Au

0+α (1.11%) 180Pt

185Hg 80 105 184.971899(17) 49.1(10) sβ+ (94%) 185Au

1/2-α (6%) 181Pt

185mHg 99.3(5) keV 21.6(15) sIT (54%) 185Hg

13/2+β+ (46%) 185Au

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α (.03%) 181Pt

186Hg 80 106 185.969362(12) 1.38(6) minβ+ (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) minβ+ 187Au

3/2-α (1.2×10−4%) 183Pt

187mHg 59(16) keV 2.4(3) minβ+ 187Au

13/2+α (2.5×10−4%) 183Pt

188Hg 80 108 187.967577(12) 3.25(15) minβ+ 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) minβ+ 189Au

3/2-α (3×10−5%) 185Pt

189mHg 80(30) keV 8.6(1) minβ+ 189Au

13/2+α (3×10−5%) 185Pt

190Hg 80 110 189.966322(17) 20.0(5) minβ+ 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) hEC 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) hβ+ (92.9%) 193Au

13/2+IT (7.1%) 193Hg

194Hg 80 114 193.965439(13) 444(77) a 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) hIT (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) hIT (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 (

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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+

^ Abbreviations:EC: Electron captureIT: Isomeric transition

1.

^ Bold for stable isotopes2.^ When produced from 180Tl can also undergo fission to 100Ru and 80Kr3.^ Believed to undergo α decay to 192Pt or β+β+ decay to 196Pt with a half-life over 2.5×1018 years4.^ Believed to undergo α decay to 194Pt5.^ Believed to undergo α decay to 195Pt6.^ Believed to undergo α decay to 196Pt7.^ Believed to undergo α decay to 197Pt8.^ Believed to undergo α decay to 198Pt9.^ Believed to undergo α decay to 200Pt or β-β- decay to 204Pb10.

Notes

Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weakassignment arguments are enclosed in parentheses.Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standarddeviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

^ http://www.scientificamerican.com/article.cfm?id=mercury-serves-up-a-nuclear-su1.^ http://www.nucleonica.net/unc.aspx2.

Isotope masses from:G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O.. Bersillon (2003). "The NUBASE evaluation of nuclear and decayproperties" (http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf). Nuclear Physics A 729: 3–128.Bibcode:2003NuPhA.729....3A (http://adsabs.harvard.edu/abs/2003NuPhA.729....3A).doi:10.1016/j.nuclphysa.2003.11.001 (http://dx.doi.org/10.1016%2Fj.nuclphysa.2003.11.001).

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 and P. D. P. Taylor (2003). "Atomicweights of the elements. Review 2000 (IUPAC Technical Report)" (http://www.iupac.org/publications/pac/75/6/0683/pdf/).Pure and Applied Chemistry 75 (6): 683–800. doi:10.1351/pac200375060683 (http://dx.doi.org/10.1351%2Fpac200375060683).M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)" (http://iupac.org/publications/pac/78/11/2051/pdf/). Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051 (http://dx.doi.org/10.1351%2Fpac200678112051). Lay summary (http://old.iupac.org/news/archives/2005/atomic-weights_revised05.html).

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 and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decayproperties" (http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf). Nuclear Physics A 729: 3–128.Bibcode:2003NuPhA.729....3A (http://adsabs.harvard.edu/abs/2003NuPhA.729....3A).doi:10.1016/j.nuclphysa.2003.11.001 (http://dx.doi.org/10.1016%2Fj.nuclphysa.2003.11.001).National Nuclear Data Center. "NuDat 2.1 database" (http://www.nndc.bnl.gov/nudat2/). Brookhaven National Laboratory.Retrieved September 2005.N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.). CRCPress. Section 11. ISBN 978-0-8493-0485-9.

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Isotopes of gold Isotopes of mercury Isotopes ofthallium

Table of nuclides

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