Mercury-186

Properties and data of the isotope ¹⁸⁶Hg.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Mercury-186; Hg-186Symbol:¹⁸⁶Hg or 18680HgMass number A:186 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:106Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.325 (= neutron-proton ratio)Neutron excess (N-Z):26Isotopic mass:185.969362(13) u (atomic weight of Mercury-186)Nuclide 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)Separation energy:S_N = 10.427(18) MeV (first neutron)
S_P = 3.970(12) MeV (first proton)Half-life:1.38(6) minDecay constant λ:0.0083713427603858 s^-1Specific activity α:2.725048934586 × 10⁺¹⁹ Bq g^-1
736499712.05049 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4017(43) femtometer fmYear of discovery:1960

Radioactive Decay

Half-life T_½ = 1.38(6) min (minutes) respectively 8.28 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁸²Pt	0.016(5) %	5.204(10) MeV
EC/β⁺	¹⁸⁶Au	99.984(5) %	3.176(24) MeV

Parent Nuclides

Direct parent isotope is: ¹⁹⁰Pb.

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
^186mHg	2217.3 keV	82(5) μs	(8-)

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-186. 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