Platinum-187
Properties and data of the isotope 187Pt.
See also: List of individual Platinum isotopes (and general data sources).
General data
Name of the isotope:Platinum-187; Pt-187Symbol:187Pt or 18778PtMass number A:187 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:109Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.3974358974359 (= neutron-proton ratio)Neutron excess (N-Z):31Isotopic mass:186.960617(26) u (atomic weight of Platinum-187)Nuclide mass:186.9178323 u (calculated nuclear mass without electrons)Mass excess:-36.68503 MeVMass defect:1.59421134 u (per nucleus)Nuclear binding energy:1484.99829794 MeV (per nucleus)
7.94116737 MeV (average binding energy per nucleon)Separation energy:SN = 6.89(3) MeV (first neutron)
SP = 4.802(29) MeV (first proton)Half-life:2.35(3) hDecay constant λ:8.193229084632 × 10-5 s-1Specific activity α:2.652730088461 × 10+17 Bq g-1
7169540.7796265 Ci g-1Spin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μN) = - 0.401(4)Quadrupole moment Q:- 0.99(4) barn (100 fm2)Nuclear g-factor:gl = -0.26733333333333Charge radius:5.4063(37) femtometer fmYear of discovery:1961
Radioactive Decay
Half-life T½ = 2.35(3) h (hours) respectively 8.460 × 103 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 187Ir | 100 % | 2.86(4) MeV | |
Parent Nuclides
Direct parent isotope is: 187Au.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 109) and isobaric (same nucleon number A = 187) with Platinum-187. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 109 | Isobar A = 187 |
|---|
| 68 | 177Er | |
| 69 | 178Tm | |
| 70 | 179Yb | |
| 71 | 180Lu | 187Lu |
| 72 | 181Hf | 187Hf |
| 73 | 182Ta | 187Ta |
| 74 | 183W | 187W |
| 75 | 184Re | 187Re |
| 76 | 185Os | 187Os |
| 77 | 186Ir | 187Ir |
| 78 | 187Pt | 187Pt |
| 79 | 188Au | 187Au |
| 80 | 189Hg | 187Hg |
| 81 | 190Tl | 187Tl |
| 82 | 191Pb | 187Pb |
| 83 | 192Bi | 187Bi |
| 84 | 193Po | 187Po |
| 85 | 194At | |
| 86 | 195Rn | |
External data and identifiers
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/platinum-187
© 1996 - 2026 ChemLin
