Isotopes of mercury

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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

[edit] 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)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
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+

[edit] 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.

[edit] 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.