Rhenium-185

Properties and data of the isotope ¹⁸⁵Re.

Contents

General data

Name of the isotope:Rhenium-185; Re-185Symbol:¹⁸⁵Re or 18575ReMass number A:185 (= number of nucleons)Atomic number Z:75 (= number of protons)Neutrons N:110Isotopic mass:184.952955(8) u (atomic weight of Rhenium-185)Nuclide mass:184.9118157 u (calculated nuclear mass without electrons)Mass excess:-43.82214 MeVMass defect:1.58706316 u (per nucleus)Nuclear binding energy:1478.33981116 MeV (per nucleus)
7.99102601 MeV (average binding energy per nucleon)Separation energy:S_N = 7.671(4) MeV (first neutron)
S_P = 5.4026(7) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μ_N) = + 3.1871(3)Charge radius:5.3596(172) femtometer fmYear of discovery:1931

Parent Nuclides

Direct parent isotopes are: ¹⁸⁵Os, ¹⁸⁵W.

Occurrence

Comparison of the natural Rhenium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Rhenium Isotopic mixture	186.207 u	100 %
Isotope ¹⁸⁵Re	184.952955(8) u	37.40(5) %	stable	5/2+
Isotope ¹⁸⁷Re	186.95575(1) u	62.60(5) %	4.33(7) × 10¹⁰ a	5/2+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ¹⁸⁵Re

Isotope:¹⁸⁵Re-NMRQuantity:37.40(5) %Spin:5/2+Nuclearmagnetic moment
μ/μ_N:+ 3.1871(3)Gyromagnetic ratio γ:6.1057 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 1.27484Quadrupole moment Q:+ 2.18(2) barn (100 fm²)Resonance frequency:v₀ = 9.7176 at 1 TRelative Sensitivity:0.13870 (H₀ = const.)
2.6628 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 185) with Rhenium-185. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 110	Isobar A = 185
69	¹⁷⁹Tm
70	¹⁸⁰Yb	¹⁸⁵Yb
71	¹⁸¹Lu	¹⁸⁵Lu
72	¹⁸²Hf	¹⁸⁵Hf
73	¹⁸³Ta	¹⁸⁵Ta
74	¹⁸⁴W	¹⁸⁵W
75	¹⁸⁵Re	¹⁸⁵Re
76	¹⁸⁶Os	¹⁸⁵Os
77	¹⁸⁷Ir	¹⁸⁵Ir
78	¹⁸⁸Pt	¹⁸⁵Pt
79	¹⁸⁹Au	¹⁸⁵Au
80	¹⁹⁰Hg	¹⁸⁵Hg
81	¹⁹¹Tl	¹⁸⁵Tl
82	¹⁹²Pb	¹⁸⁵Pb
83	¹⁹³Bi	¹⁸⁵Bi
84	¹⁹⁴Po
85	¹⁹⁵At
86	¹⁹⁶Rn