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Mercury-181

Properties and data of the isotope 181Hg.

Contents
General Data
Radioactive Decay
Isotones und Isobares

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

 

General data

Name of the isotope:Mercury-181; Hg-181Symbol:181Hg or 18180HgMass number A:181 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:101Isotopic mass:180.977819(17) u (atomic weight of Mercury-181)Nuclide mass:180.9339374 u (calculated nuclear mass without electrons)Mass excess:-20.66147 MeVMass defect:1.523340076 u (per nucleus)Nuclear binding energy:1418.98214075 MeV (per nucleus)
7.83968034 MeV (average binding energy per nucleon)Separation energy:SN = 8.482(20) MeV (first neutron)
SP = 2.325(16) MeV (first proton)Half-life:3.6(1) sDecay constant λ:0.19254088348887 s-1Specific activity α:6.441712898148 × 10+20 Bq g-1
17410034859.86 Ci g-1Spin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μN) = + 0.5071(7)Nuclear g-factor:gl = 1.0142Charge radius:5.4364(32) femtometer fmYear of discovery:1969

 

Radioactive Decay

Half-life T½ = 3.6(1) s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
α177Pt27(2) %6.284(4) MeV
EC/β+181Au73(2) %7.210(25) MeV
EC, p180Pt0.013(3) %
EC, α177Irtrace

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 101) and isobaric (same nucleon number A = 181) with Mercury-181. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 101Isobar A = 181
58159Ce
59160Pr
60161Nd
61162Pm
62163Sm
63164Eu
64165Gd
65166Tb
66167Dy
67168Ho
68169Er
69170Tm
70171Yb181Yb
71172Lu181Lu
72173Hf181Hf
73174Ta181Ta
74175W181W
75176Re181Re
76177Os181Os
77178Ir181Ir
78179Pt181Pt
79180Au181Au
80181Hg181Hg
81182Tl181Tl
82183Pb181Pb
83184Bi

 

External data and identifiers

Adopted Levels, Gammas:NuDat 181Hg

 

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Last update: 2020-10-22

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