Mercury-197

Properties and data of the isotope ¹⁹⁷Hg.

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-197; Hg-197Symbol:¹⁹⁷Hg or 19780HgMass number A:197 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:117Isotopic mass:196.967214(3) u (atomic weight of Mercury-197)Nuclide mass:196.9233324 u (calculated nuclear mass without electrons)Mass excess:-30.53996 MeVMass defect:1.672583732 u (per nucleus)Nuclear binding energy:1558.00171086 MeV (per nucleus)
7.90863813 MeV (average binding energy per nucleon)Separation energy:S_N = 6.7856(15) MeV (first neutron)
S_P = 6.690(3) MeV (first proton)Half-life:64.14(5) hDecay constant λ:3.001884681772 × 10^-6 s^-1Specific activity α:9.223353264754 × 10⁺¹⁵ Bq g^-1
249279.81796634 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Charge radius:5.4412(31) femtometer fmYear of discovery:1941

Radioactive Decay

Half-life T_½ = 64.14(5) h (hours) respectively 2.30904 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	¹⁹⁷Au	100 %	0.600(3) MeV

Parent Nuclides

Direct parent isotope is: ¹⁹⁷Tl.

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
^197mHg	298.93(8) keV	23.8(1) h	13/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 117) and isobaric (same nucleon number A = 197) with Mercury-197. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 117	Isobar A = 197
71	¹⁸⁸Lu
72	¹⁸⁹Hf
73	¹⁹⁰Ta
74	¹⁹¹W	¹⁹⁷W
75	¹⁹²Re	¹⁹⁷Re
76	¹⁹³Os	¹⁹⁷Os
77	¹⁹⁴Ir	¹⁹⁷Ir
78	¹⁹⁵Pt	¹⁹⁷Pt
79	¹⁹⁶Au	¹⁹⁷Au
80	¹⁹⁷Hg	¹⁹⁷Hg
81	¹⁹⁸Tl	¹⁹⁷Tl
82	¹⁹⁹Pb	¹⁹⁷Pb
83	²⁰⁰Bi	¹⁹⁷Bi
84	²⁰¹Po	¹⁹⁷Po
85	²⁰²At	¹⁹⁷At
86	²⁰³Rn	¹⁹⁷Rn
87	²⁰⁴Fr
88	²⁰⁵Ra
89	²⁰⁶Ac
90	²⁰⁷Th