Mercury-187
Properties and data of the isotope 187Hg.
See also: List of individual Mercury isotopes (and general data sources).
General data
Name of the isotope:Mercury-187; Hg-187Symbol:187Hg or 18780HgMass number A:187 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:107Isotopic mass:186.969814(15) u (atomic weight of Mercury-187)Nuclide mass:186.9259324 u (calculated nuclear mass without electrons)Mass excess:-28.11808 MeVMass defect:1.583334572 u (per nucleus)Nuclear binding energy:1474.86665381 MeV (per nucleus)
7.88698745 MeV (average binding energy per nucleon)Separation energy:SN = 7.650(18) MeV (first neutron)
SP = 3.692(25) MeV (first proton)Half-life:1.9(3) minDecay constant λ:0.0060802384259644 s-1Specific activity α:1.968604960384 × 10+19 Bq g-1
532055394.69859 Ci g-1Spin and parity:
(nuclear angular momentum)3/2(-)Magnetic dipole moment:μ(μN) = - 0.594(4)Quadrupole moment Q:- 0.75(25) barn (100 fm2)Nuclear g-factor:gl = -0.396Charge radius:5.4046(42) femtometer fmYear of discovery:1960
Radioactive Decay
Half-life T½ = 1.9(3) min (minutes) respectively 1.14 × 102 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 183Pt | < 0.00037 % | 5.230(14) MeV | |
| EC/β+ | 187Au | > 99.9996 % | 4.910(26) MeV | |
Parent Nuclides
Direct parent isotopes are: 191Pb, 187Tl.
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 |
|---|
| 187mHg | | 2.4(3) min | 13/2(+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 107) and isobaric (same nucleon number A = 187) with Mercury-187. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 107 | Isobar A = 187 |
|---|
| 65 | 172Tb | |
| 66 | 173Dy | |
| 67 | 174Ho | |
| 68 | 175Er | |
| 69 | 176Tm | |
| 70 | 177Yb | |
| 71 | 178Lu | 187Lu |
| 72 | 179Hf | 187Hf |
| 73 | 180Ta | 187Ta |
| 74 | 181W | 187W |
| 75 | 182Re | 187Re |
| 76 | 183Os | 187Os |
| 77 | 184Ir | 187Ir |
| 78 | 185Pt | 187Pt |
| 79 | 186Au | 187Au |
| 80 | 187Hg | 187Hg |
| 81 | 188Tl | 187Tl |
| 82 | 189Pb | 187Pb |
| 83 | 190Bi | 187Bi |
| 84 | 191Po | 187Po |
| 85 | 192At | |
| 86 | 193Rn | |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/mercury-187
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