Mercury-186m

Properties and data of the isotope ^186mHg.

Contents

See also: List of individual Mercury isotopes (and general data sources).

General data

Name of the isotope:Mercury-186m; Hg-186mSymbol:^186mHg or 186m80HgMass number A:186 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:106Isotopic mass:185.969362(13) u (atomic weight of Mercury-186m)
Excitation energy: 2217.3 keVNuclide mass:185.9254804 u (calculated nuclear mass without electrons)Mass excess:-28.53911 MeVMass defect:1.575121656 u (per nucleus)Nuclear binding energy:1467.21637183 MeV (per nucleus)
7.88826006 MeV (average binding energy per nucleon)Half-life:82(5) μsDecay constant λ:8453.0143970725 s^-1Specific activity α:2.75163477785 × 10⁺²⁵ Bq g^-1
7.436850750948 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)(8-)

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
¹⁸⁶Hg		1.38(6) min	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 186) with Mercury-186m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 106	Isobar A = 186
64	¹⁷⁰Gd
65	¹⁷¹Tb
66	¹⁷²Dy
67	¹⁷³Ho
68	¹⁷⁴Er
69	¹⁷⁵Tm
70	¹⁷⁶Yb
71	¹⁷⁷Lu	¹⁸⁶Lu
72	¹⁷⁸Hf	¹⁸⁶Hf
73	¹⁷⁹Ta	¹⁸⁶Ta
74	¹⁸⁰W	¹⁸⁶W
75	¹⁸¹Re	¹⁸⁶Re
76	¹⁸²Os	¹⁸⁶Os
77	¹⁸³Ir	¹⁸⁶Ir
78	¹⁸⁴Pt	¹⁸⁶Pt
79	¹⁸⁵Au	¹⁸⁶Au
80	¹⁸⁶Hg	¹⁸⁶Hg
81	¹⁸⁷Tl	¹⁸⁶Tl
82	¹⁸⁸Pb	¹⁸⁶Pb
83	¹⁸⁹Bi	¹⁸⁶Bi
84	¹⁹⁰Po	¹⁸⁶Po
85	¹⁹¹At