Mercury-195

Properties and data of the isotope ¹⁹⁵Hg.

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-195; Hg-195Symbol:¹⁹⁵Hg or 19580HgMass number A:195 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:115Isotopic mass:194.966706(25) u (atomic weight of Mercury-195)Nuclide mass:194.9228244 u (calculated nuclear mass without electrons)Mass excess:-31.01316 MeVMass defect:1.6557619 u (per nucleus)Nuclear binding energy:1542.33227528 MeV (per nucleus)
7.90939628 MeV (average binding energy per nucleon)Separation energy:S_N = 6.901(23) MeV (first neutron)
S_P = 6.090(23) MeV (first proton)Half-life:10.53(3) hDecay constant λ:1.828498418697 × 10^-5 s^-1Specific activity α:5.676018061633 × 10⁺¹⁶ Bq g^-1
1534058.9355767 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μ_N) = + 0.5414749(14)Nuclear g-factor:g_l = 1.0829498Charge radius:5.4345(32) femtometer fmYear of discovery:1952

Radioactive Decay

Half-life T_½ = 10.53(3) h (hours) respectively 3.7908 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁹⁵Au	100 %	1.554(23) MeV

Parent Nuclides

Direct parent isotope is: ¹⁹⁵Tl.

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
^195mHg	176.07(4) keV	41.6(8) h	13/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 115) and isobaric (same nucleon number A = 195) with Mercury-195. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 115	Isobar A = 195
70	¹⁸⁵Yb
71	¹⁸⁶Lu
72	¹⁸⁷Hf
73	¹⁸⁸Ta
74	¹⁸⁹W	¹⁹⁵W
75	¹⁹⁰Re	¹⁹⁵Re
76	¹⁹¹Os	¹⁹⁵Os
77	¹⁹²Ir	¹⁹⁵Ir
78	¹⁹³Pt	¹⁹⁵Pt
79	¹⁹⁴Au	¹⁹⁵Au
80	¹⁹⁵Hg	¹⁹⁵Hg
81	¹⁹⁶Tl	¹⁹⁵Tl
82	¹⁹⁷Pb	¹⁹⁵Pb
83	¹⁹⁸Bi	¹⁹⁵Bi
84	¹⁹⁹Po	¹⁹⁵Po
85	²⁰⁰At	¹⁹⁵At
86	²⁰¹Rn	¹⁹⁵Rn
87	²⁰²Fr
88	²⁰³Ra
89	²⁰⁴Ac