Isotopes of mercury#Mercury-197
{{Short description|none}}
{{Infobox mercury isotopes}}
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 40 radioisotopes have half-lives that are less than a day. 199Hg and 201Hg are the most often studied NMR-active nuclei, having spin quantum numbers of 1/2 and 3/2 respectively. All isotopes of mercury are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed. These isotopes are predicted to undergo either alpha decay or double beta decay.
List of isotopes
{{Anchor}}
{{Isotopes table
|symbol=Hg
|refs=NUBASE2020, AME2020 II
|notes=m, unc(), mass#, exen#, hl#, spin(), spin#, daughter-st, IT, EC
}}
|-id=Mercury-170
| 170Hg
| style="text-align:right" | 80
| style="text-align:right" | 90
| 170.00581(32)#
| 310(250) μs
| α
| 166Pt
| 0+
|
|
|-id=Mercury-171
| 171Hg
| style="text-align:right" | 80
| style="text-align:right" | 91
| 171.00359(33)#
| 70(30) μs
| α
| 167Pt
| 3/2−#
|
|
|-id=Mercury-172
| 172Hg
| style="text-align:right" | 80
| style="text-align:right" | 92
| 171.99886(16)
| 231(9) μs
| α
| 168Pt
| 0+
|
|
|-id=Mercury-173
| 173Hg
| style="text-align:right" | 80
| style="text-align:right" | 93
| 172.99714(22)#
| 800(80) μs
| α
| 169Pt
| (7/2−)
|
|
|-id=Mercury-174
| 174Hg
| style="text-align:right" | 80
| style="text-align:right" | 94
| 173.992871(21)
| 2.0(4) ms
| α
| 170Pt
| 0+
|
|
|-id=Mercury-175
| 175Hg
| style="text-align:right" | 80
| style="text-align:right" | 95
| 174.99144(9)
| 10.2(3) ms
| α
| 171Pt
| (7/2−)
|
|
|-id=Mercury-175m
| style="text-indent:1em" | 175mHg
| colspan="3" style="text-indent:2em" | 494(2) keV
| 340(30) ns
| IT
| 175Hg
| (13/2+)
|
|
|-id=Mercury-176
| rowspan=2|176Hg
| rowspan=2 style="text-align:right" | 80
| rowspan=2 style="text-align:right" | 96
| rowspan=2|175.987349(12)
| rowspan=2|20.3(14) ms
| α (90%)
| 172Pt
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β+ (10%)
| 176Au
|-id=Mercury-177
| 177Hg
| style="text-align:right" | 80
| style="text-align:right" | 97
| 176.98628(9)
| 117(7) ms
| α
| 173Pt
| 7/2−
|
|
|-id=Mercury-177m
| style="text-indent:1em" | 177mHg
| colspan="3" style="text-indent:2em" | 323.2(13) keV
| 1.50(15) μs
| IT
| 177Hg
| 13/2+
|
|
|-id=Mercury-178
| rowspan=2|178Hg
| rowspan=2 style="text-align:right" | 80
| rowspan=2 style="text-align:right" | 98
| rowspan=2|177.982485(12)
| rowspan=2|266.5(24) ms
| α (89%)
| 174Pt
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β+ (11%)
| 178Au
|-id=Mercury-179
| rowspan=3|179Hg
| rowspan=3 style="text-align:right" | 80
| rowspan=3 style="text-align:right" | 99
| rowspan=3|178.98182(3)
| rowspan=3|1.05(3) s
| α (75%)
| 175Pt
| rowspan=3|7/2−
| rowspan=3|
| rowspan=3|
|-
| β+ (25%)
| 179Au
|-
| β+, p (0.15%)
| 178Pt
|-id=Mercury-179m
| style="text-indent:1em" | 179mHg
| colspan="3" style="text-indent:2em" | 171.4(4) keV
| 6.4(9) μs
| IT
| 179Hg
| 13/2+
|
|
|-id=Mercury-180
| rowspan=2|180Hg
| rowspan=2 style="text-align:right" | 80
| rowspan=2 style="text-align:right" | 100
| rowspan=2|179.978260(14)
| rowspan=2|2.59(1) s
| β+ (52%)
| 180Au
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| α (48%)
| 176Pt
|-id=Mercury-181
| rowspan=4|181Hg
| rowspan=4 style="text-align:right" | 80
| rowspan=4 style="text-align:right" | 101
| rowspan=4|180.977819(17)
| rowspan=4|3.6(1) s
| β+ (73%)
| 181Au
| rowspan=4|1/2−
| rowspan=4|
| rowspan=4|
|-
| α (27%)
| 177Pt
|-
| β+, p (0.014%)
| 180Pt
|-
| β+, α (9×10−6%)
| 177Ir
|-id=Mercury-181m
| style="text-indent:1em" | 181mHg
| colspan="3" style="text-indent:2em" | 210(50) keV
| 480(20) μs
| IT
| 181Hg
| 13/2+
|
|
|-id=Mercury-182
| rowspan=3|182Hg
| rowspan=3 style="text-align:right" | 80
| rowspan=3 style="text-align:right" | 102
| rowspan=3|181.974689(11)
| rowspan=3|10.83(6) s
| β+ (86.2%)
| 182Au
| rowspan=3|0+
| rowspan=3|
| rowspan=3|
|-
| α (13.8%)
| 178Pt
|-
| β+, p (<1×10−5%)
| 181Pt
|-id=Mercury-183
| rowspan=3|183Hg
| rowspan=3 style="text-align:right" | 80
| rowspan=3 style="text-align:right" | 103
| rowspan=3|182.974445(8)
| rowspan=3|9.4(7) s
| β+ (88.3%)
| 183Au
| rowspan=3|1/2−
| rowspan=3|
| rowspan=3|
|-
| α (11.7%)
| 179Pt
|-
| β+, p (2.6×10−4%)
| 182Pt
|-id=Mercury-183m
| style="text-indent:1em" | 183mHg
| colspan="3" style="text-indent:2em" | 204(14) keV
| >5# μs
|
|
| 13/2+#
|
|
|-id=Mercury-184
| rowspan=2|184Hg
| rowspan=2 style="text-align:right" | 80
| rowspan=2 style="text-align:right" | 104
| rowspan=2|183.971718(10)
| rowspan=2|30.87(26) s
| β+ (98.89%)
| 184Au
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| α (1.11%)
| 180Pt
|-id=Mercury-185
| rowspan=2|185Hg
| rowspan=2 style="text-align:right" | 80
| rowspan=2 style="text-align:right" | 105
| rowspan=2|184.971891(15)
| rowspan=2|49.1(10) s
| β+ (94%)
| 185Au
| rowspan=2|1/2−
| rowspan=2|
| rowspan=2|
|-
| α (6%)
| 181Pt
|-id=Mercury-185m
| rowspan=3 style="text-indent:1em" | 185mHg
| rowspan=3 colspan="3" style="text-indent:2em" | 103.7(4) keV
| rowspan=3|21.6(15) s
| IT (54%)
| 185Hg
| rowspan=3|13/2+
| rowspan=3|
| rowspan=3|
|-
| β+ (46%)
| 185Au
|-
| α (0.03%)
| 181Pt
|-id=Mercury-186
| rowspan=2|186Hg
| rowspan=2 style="text-align:right" | 80
| rowspan=2 style="text-align:right" | 106
| rowspan=2|185.969362(13)
| rowspan=2|1.38(6) min
| β+ (99.98%)
| 186Au
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| α (0.016%)
| 182Pt
|-id=Mercury-186m
| style="text-indent:1em" | 186mHg
| colspan="3" style="text-indent:2em" | 2217.3(4) keV
| 82(5) μs
| IT
| 186Hg
| (8−)
|
|
|-id=Mercury-187
| 187Hg
| style="text-align:right" | 80
| style="text-align:right" | 107
| 186.969814(14)
| 1.9(3) min
| β+
| 187Au
| 3/2−
|
|
|-id=Mercury-187m
| style="text-indent:1em" | 187mHg
| colspan="3" style="text-indent:2em" | 58(14) keV
| 2.4(3) min
| β+
| 187Au
| 13/2+
|
|
|-id=Mercury-188
| rowspan=2|188Hg
| rowspan=2 style="text-align:right" | 80
| rowspan=2 style="text-align:right" | 108
| rowspan=2|187.967581(7)
| rowspan=2|3.25(15) min
| β+
| 188Au
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| α (3.7×10−5%)
| 184Pt
|-id=Mercury-188m
| style="text-indent:1em" | 188mHg
| colspan="3" style="text-indent:2em" | 2724.1(4) keV
| 142(14) ns
| IT
| 188Hg
| 12+
|
|
|-id=Mercury-189
| 189Hg
| style="text-align:right" | 80
| style="text-align:right" | 109
| 188.96819(3)
| 7.6(2) min
| β+
| 189Au
| 3/2−
|
|
|-id=Mercury-189m
| style="text-indent:1em" | 189mHg
| colspan="3" style="text-indent:2em" | 80(30) keV
| 8.6(2) min
| β+
| 189Au
| 13/2+
|
|
|-id=Mercury-190
| 190Hg
| style="text-align:right" | 80
| style="text-align:right" | 110
| 189.966322(17)
| 20.0(5) min
| β+
| 190Au
| 0+
|
|
|-id=Mercury-191
| 191Hg
| style="text-align:right" | 80
| style="text-align:right" | 111
| 190.967158(24)
| 49(10) min
| β+
| 191Au
| 3/2−
|
|
|-id=Mercury-191m
| style="text-indent:1em" | 191mHg
| colspan="3" style="text-indent:2em" | 128(22) keV
| 50.8(15) min
| β+
| 191Au
| 13/2+
|
|
|-id=Mercury-192
| 192Hg
| style="text-align:right" | 80
| style="text-align:right" | 112
| 191.965634(17)
| 4.85(20) h
| EC
| 192Au
| 0+
|
|
|-id=Mercury-193
| 193Hg
| style="text-align:right" | 80
| style="text-align:right" | 113
| 192.966653(17)
| 3.80(15) h
| β+
| 193Au
| 3/2−
|
|
|-id=Mercury-193m
| rowspan=2 style="text-indent:1em" | 193mHg
| rowspan=2 colspan="3" style="text-indent:2em" | 140.76(5) keV
| rowspan=2|11.8(2) h
| β+ (92.8%)
| 193Au
| rowspan=2|13/2+
| rowspan=2|
| rowspan=2|
|-
| IT (7.2%)
| 193Hg
|-id=Mercury-194
| 194Hg
| style="text-align:right" | 80
| style="text-align:right" | 114
| 193.965449(3)
| 447(28) y
| EC
| 194Au
| 0+
|
|
|-id=Mercury-195
| 195Hg
| style="text-align:right" | 80
| style="text-align:right" | 115
| 194.966706(25)
| 10.69(16) h
| β+
| 195Au
| 1/2−
|
|
|-id=Mercury-195m
| rowspan=2 style="text-indent:1em" | 195mHg
| rowspan=2 colspan="3" style="text-indent:2em" | 176.07(4) keV
| rowspan=2|41.60(19) h
| IT (54.2%)
| 195Hg
| rowspan=2|13/2+
| rowspan=2|
| rowspan=2|
|-
| β+ (45.8%)
| 195Au
|-id=Mercury-196
| 196Hg
| style="text-align:right" | 80
| style="text-align:right" | 116
| 195.965833(3)
| colspan=3 align=center|Observationally StableBelieved to undergo β+β+ decay to 196Pt with a half-life over 2.5×1018 years; also theorized to undergo α decay to 192Pt
| 0+
| 0.0015(1)
|
|-id=Mercury-197
| 197Hg
| style="text-align:right" | 80
| style="text-align:right" | 117
| 196.967214(3)
| 64.93(7) h
| EC
| 197Au
| 1/2−
|
|
|-id=Mercury-197m
| rowspan=2 style="text-indent:1em" | 197mHg
| rowspan=2 colspan="3" style="text-indent:2em" | 298.93(8) keV
| rowspan=2|23.82(4) h
| IT (94.68%)
| 197Hg
| rowspan=2|13/2+
| rowspan=2|
| rowspan=2|
|-
| EC (5.32%)
| 197Au
|-id=Mercury-198
| 198Hg
| style="text-align:right" | 80
| style="text-align:right" | 118
| 197.9667692(5)
| colspan=3 align=center|Observationally StableBelieved to undergo α decay to 194Pt
| 0+
| 0.1004(3)
|
|-id=Mercury-199
| 199Hg
| style="text-align:right" | 80
| style="text-align:right" | 119
| 198.9682810(6)
| colspan=3 align=center|Observationally StableBelieved to undergo α decay to 195Pt
| 1/2−
| 0.1694(12)
|
|-id=Mercury-199m
| style="text-indent:1em" | 199mHg
| colspan="3" style="text-indent:2em" | 532.48(10) keV
| 42.67(9) min
| IT
| 199Hg
| 13/2+
|
|
|-id=Mercury-200
| 200Hg
| style="text-align:right" | 80
| style="text-align:right" | 120
| 199.9683269(6)
| colspan=3 align=center|Observationally StableBelieved to undergo α decay to 196Pt
| 0+
| 0.2314(9)
|
|-id=Mercury-201
| 201Hg
| style="text-align:right" | 80
| style="text-align:right" | 121
| 200.9703031(8)
| colspan=3 align=center|Observationally StableBelieved to undergo α decay to 197Pt
| 3/2−
| 0.1317(9)
|
|-id=Mercury-201m
| style="text-indent:1em" | 201mHg
| colspan="3" style="text-indent:2em" | 766.22(15) keV
| 94.0(20) μs
| IT
| 201Hg
| 13/2+
|
|
|-id=Mercury-202
| 202Hg
| style="text-align:right" | 80
| style="text-align:right" | 122
| 201.9706436(8)
| colspan=3 align=center|Observationally StableBelieved to undergo α decay to 198Pt
| 0+
| 0.2974(13)
|
|-id=Mercury-203
| 203Hg
| style="text-align:right" | 80
| style="text-align:right" | 123
| 202.9728724(18)
| 46.610(10) d
| β−
| 203Tl
| 5/2−
|
|
|-id=Mercury-203m1
| style="text-indent:1em" | 203m1Hg
| colspan="3" style="text-indent:2em" | 933.14(23) keV
| 22.1(10) μs
| IT
| 203Hg
| (13/2+)
|
|
|-id=Mercury-203m2
| style="text-indent:1em" | 203m2Hg
| colspan="3" style="text-indent:2em" | 8281.3(5) keV
| 146(30) ns
| IT
| 203Hg
| (53/2+)
|
|
|-id=Mercury-204
| 204Hg
| style="text-align:right" | 80
| style="text-align:right" | 124
| 203.9734940(5)
| colspan=3 align=center|Observationally StableBelieved to undergo β−β− decay to 204Pb
| 0+
| 0.0682(4)
|
|-id=Mercury-204m
| style="text-indent:1em" | 204mHg
| colspan="3" style="text-indent:2em" | 7226.08(17) keV
| ~485 ns
| IT
| 204Hg
| 22+
|
|
|-id=Mercury-205
| 205Hg
| style="text-align:right" | 80
| style="text-align:right" | 125
| 204.976073(4)
| 5.14(9) min
| β−
| 205Tl
| 1/2−
|
|
|-id=Mercury-205m1
| style="text-indent:1em" | 205m1Hg
| colspan="3" style="text-indent:2em" | 1556.4(3) keV
| 1.09(4) ms
| IT
| 205Hg
| 13/2+
|
|
|-id=Mercury-205m2
| style="text-indent:1em" | 205m2Hg
| colspan="3" style="text-indent:2em" | 3316.6(8) keV
| 5.89(18) μs
| IT
| 205Hg
| (23/2−)
|
|
|-id=Mercury-206
| 206Hg
| style="text-align:right" | 80
| style="text-align:right" | 126
| 205.977514(22)
| 8.32(7) min
| β−
| 206Tl
| 0+
| TraceIntermediate decay product of 238U
|
|-id=Mercury-206m1
| style="text-indent:1em" | 206m1Hg
| colspan="3" style="text-indent:2em" |2102.4(3) keV
| 2.088(17) μs
| IT
| 206Hg
| 5−
|
|
|-id=Mercury-206m2
| style="text-indent:1em" | 206m2Hg
| colspan="3" style="text-indent:2em" |3722.3(10) keV
| 106(3) ns
| IT
| 206Hg
| (10+)
|
|
|-id=Mercury-207
| 207Hg
| style="text-align:right" | 80
| style="text-align:right" | 127
| 206.98230(3)
| 2.9(2) min
| β−
| 207Tl
| 9/2+
|
|
|-id=Mercury-208
| 208Hg
| style="text-align:right" | 80
| style="text-align:right" | 128
| 207.98576(3)
| 135(10) s
| β−
| 208Tl
| 0+
|
|
|-id=Mercury-208m
| style="text-indent:1em" | 208mHg
| colspan="3" style="text-indent:2em" |1338(24) keV
| 99(14) ns
| IT
| 208Hg
| (8+)
|
|
|-id=Mercury-209
| 209Hg
| style="text-align:right" | 80
| style="text-align:right" | 129
| 208.99076(16)#
| 6.3(11) s
| β−
| 209Tl
| 9/2+#
|
|
|-id=Mercury-210
| rowspan=2|210Hg
| rowspan=2 style="text-align:right" | 80
| rowspan=2 style="text-align:right" | 130
| rowspan=2|209.99431(22)#
| rowspan=2|64(12) s
| β− (97.8%)
| 210Tl
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β−, n (2.2%)
| 209Tl
|-id=Mercury-210m1
| style="text-indent:1em" | 210m1Hg
| colspan="3" style="text-indent:2em" |663(2) keV
| 2.1(7) μs
| IT
| 210Hg
| (3−)
|
|
|-id=Mercury-210m2
| style="text-indent:1em" | 210m2Hg
| colspan="3" style="text-indent:2em" |1406(23) keV
| 2(1) μs
| IT
| 210Hg
| 8+#
|
|
|-id=Mercury-211
| rowspan=2|211Hg
| rowspan=2 style="text-align:right" | 80
| rowspan=2 style="text-align:right" | 131
| rowspan=2|210.99958(22)#
| rowspan=2|26.4(81) s
| β− (93.7%)
| 211Tl
| rowspan=2|9/2+#
| rowspan=2|
| rowspan=2|
|-
| β−, n (6.3%)
| 210Tl
|-id=Mercury-212
| 212Hg
| style="text-align:right" | 80
| style="text-align:right" | 132
| 212.00324(32)#
| 30# s
[>300 ns]
|
|
| 0+
|
|
|-id=Mercury-213
| 213Hg
| style="text-align:right" | 80
| style="text-align:right" | 133
| 213.00880(32)#
| 15# s
[>300 ns]
|
|
| 9/2+#
|
|
|-id=Mercury-214
| 214Hg
| style="text-align:right" | 80
| style="text-align:right" | 134
| 214.01264(43)#
| 8# s
[>300 ns]
|
|
| 0+
|
|
|-id=Mercury-215
| 215Hg
| style="text-align:right" | 80
| style="text-align:right" | 135
| 215.01837(43)#
| 600# ms
[>300 ns]
|
|
| 9/2+#
|
|
|-id=Mercury-216
| 216Hg
| style="text-align:right" | 80
| style="text-align:right" | 136
| 216.02246(43)#
| 2# s
[>300 ns]
|
|
| 0+
|
|
{{Isotopes table/footer}}
References
{{Reflist}}
- Isotopic compositions and standard atomic masses from:
- {{CIAAW2003}}
- {{CIAAW 2005}}
- Half-life, spin, and isomer data selected from the following sources.
- {{NUBASE 2003}}
- {{NUBASE 2016}}
- {{NNDC}}
- {{CRC85|chapter=11}}
{{Navbox element isotopes}}
{{Authority control}}