Mercury-198

Properties and data of the isotope ¹⁹⁸Hg.

Contents

See also: List of individual Mercury isotopes (and general data sources).

General data

Name of the isotope:Mercury-198; Hg-198Symbol:¹⁹⁸Hg or 19880HgMass number A:198 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:118Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.475 (= neutron-proton ratio)Neutron excess (N-Z):38Isotopic mass:197.966769(3) u (atomic weight of Mercury-198)Nuclide mass:197.9228874 u (calculated nuclear mass without electrons)Mass excess:-30.95448 MeVMass defect:1.681693648 u (per nucleus)Nuclear binding energy:1566.48754295 MeV (per nucleus)
7.91155325 MeV (average binding energy per nucleon)Separation energy:S_N = 8.485(3) MeV (first neutron)
S_P = 7.1035(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.4463(31) femtometer fmYear of discovery:1925

Parent Nuclides

Direct parent isotopes are: ¹⁹⁸Tl, ¹⁹⁸Au, ²⁰²Pb.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Mercury Isotopic mixture	200.592 u	100 %
Isotope ¹⁹⁶Hg	195.96583(2) u	0.15(1) %	stable	0+
Isotope ¹⁹⁸Hg	197.966769(3) u	10.04(3) %	stable	0+
Isotope ²⁰⁰Hg	199.968327(3) u	23.14(9) %	stable	0+
Isotope ²⁰²Hg	201.970643(5) u	29.74(13) %	stable	0+
Isotope ²⁰⁴Hg	203.973494(3) u	6.82(4) %	stable	0+
Isotope ²⁰¹Hg	200.970303(5) u	13.17(9) %	stable	3/2-
Isotope ¹⁹⁹Hg	198.968281(3) u	16.94(12) %	stable	1/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 118) and isobaric (same nucleon number A = 198) with Mercury-198. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 118	Isobar A = 198
72	¹⁹⁰Hf
73	¹⁹¹Ta
74	¹⁹²W
75	¹⁹³Re	¹⁹⁸Re
76	¹⁹⁴Os	¹⁹⁸Os
77	¹⁹⁵Ir	¹⁹⁸Ir
78	¹⁹⁶Pt	¹⁹⁸Pt
79	¹⁹⁷Au	¹⁹⁸Au
80	¹⁹⁸Hg	¹⁹⁸Hg
81	¹⁹⁹Tl	¹⁹⁸Tl
82	²⁰⁰Pb	¹⁹⁸Pb
83	²⁰¹Bi	¹⁹⁸Bi
84	²⁰²Po	¹⁹⁸Po
85	²⁰³At	¹⁹⁸At
86	²⁰⁴Rn	¹⁹⁸Rn
87	²⁰⁵Fr
88	²⁰⁶Ra
89	²⁰⁷Ac
90	²⁰⁸Th