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Isotopes of mercury



There are seven stable isotopes of mercury (Hg) with Hg-202 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 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.
Standard atomic mass: 200.59(2) u

Additional recommended knowledge

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
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 5/2-#
176Hg 80 96 175.987355(15) 20.4(15) ms 0+
177Hg 80 97 176.98628(8) 127.3(18) ms 5/2-#
178Hg 80 98 177.982483(14) 0.269(3) s 0+
179Hg 80 99 178.981834(29) 1.09(4) s 5/2-#
180Hg 80 100 179.978266(15) 2.58(1) s 0+
181Hg 80 101 180.977819(17) 3.6(1) s 1/2(-)
181mHg 210(40)# keV 13/2+
182Hg 80 102 181.97469(1) 10.83(6) s 0+
183Hg 80 103 182.974450(9) 9.4(7) s 1/2-
183m1Hg 198(14) keV 13/2+#
183m2Hg 240(40)# keV 5# s 13/2+#
184Hg 80 104 183.971713(11) 30.6(3) s 0+
185Hg 80 105 184.971899(17) 49.1(10) s 1/2-
185mHg 99.3(5) keV 21.6(15) s 13/2+
186Hg 80 106 185.969362(12) 1.38(6) min 0+
186mHg 2217.3(4) keV 82(5) µs (8-)
187Hg 80 107 186.969814(15) 1.9(3) min 3/2-
187mHg 59(16) keV 2.4(3) min 13/2+
188Hg 80 108 187.967577(12) 3.25(15) min 0+
188mHg 2724.3(4) keV 134(15) ns (12+)
189Hg 80 109 188.96819(4) 7.6(1) min 3/2-
189mHg 80(30) keV 8.6(1) min 13/2+
190Hg 80 110 189.966322(17) 20.0(5) min 0+
191Hg 80 111 190.967157(24) 49(10) min 3/2(-)
191mHg 128(22) keV 50.8(15) min 13/2+
192Hg 80 112 191.965634(17) 4.85(20) h 0+
193Hg 80 113 192.966665(17) 3.80(15) h 3/2-
193mHg 140.76(5) keV 11.8(2) h 13/2+
194Hg 80 114 193.965439(13) 444(77) a 0+
195Hg 80 115 194.966720(25) 10.53(3) h 1/2-
195mHg 176.07(4) keV 41.6(8) h 13/2+
196Hg 80 116 195.965833(3) STABLE [>2.5E+18 a] 0+ 0.0015(1)
197Hg 80 117 196.967213(3) 64.14(5) h 1/2-
197mHg 298.93(8) keV 23.8(1) h 13/2+
198Hg 80 118 197.9667690(4) STABLE 0+ 0.0997(20)
199Hg 80 119 198.9682799(4) STABLE 1/2- 0.1687(22)
199mHg 532.48(10) keV 42.66(8) min 13/2+
200Hg 80 120 199.9683260(4) STABLE 0+ 0.2310(19)
201Hg 80 121 200.9703023(6) STABLE 3/2- 0.1318(9)
201mHg 766.22(15) keV 94(3) µs 13/2+
202Hg 80 122 201.9706430(6) STABLE 0+ 0.2986(26)
203Hg 80 123 202.9728725(18) 46.595(6) d 5/2-
203mHg 933.14(23) keV 24(4) µs (13/2+)
204Hg 80 124 203.9734939(4) STABLE 0+ 0.0687(15)
205Hg 80 125 204.976073(4) 5.14(9) min 1/2-
205mHg 1556.40(17) keV 1.09(4) ms 13/2+
206Hg 80 126 205.977514(22) 8.15(10) min 0+
207Hg 80 127 206.98259(16) 2.9(2) min (9/2+)
208Hg 80 128 207.98594(32)# 42(5) min [41(+5-4) min] 0+
209Hg 80 129 208.99104(21)# 37(8) s 9/2+#
210Hg 80 130 209.99451(32)# 10# min [>300 ns] 0+

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

  • Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
  • Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
  • Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
    • Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
    • National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
    • David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.


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Index to isotope pages
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_mercury". A list of authors is available in Wikipedia.
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