Mercury-202

Properties and data of the isotope ²⁰²Hg.

Contents

General data

Name of the isotope:Mercury-202; Hg-202Symbol:²⁰²Hg or 20280HgMass number A:202 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:122Isotopic mass:201.970643(5) u (atomic weight of Mercury-202)Nuclide mass:201.9267614 u (calculated nuclear mass without electrons)Mass excess:-27.34587 MeVMass defect:1.712479312 u (per nucleus)Nuclear binding energy:1595.16420425 MeV (per nucleus)
7.8968525 MeV (average binding energy per nucleon)Separation energy:S_N = 7.75410(20) MeV (first neutron)
S_P = 8.234(3) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.4648(33) femtometer fmYear of discovery:1920

Parent Nuclides

Direct parent isotopes are: ²⁰²Tl, ²⁰²Au.

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 ¹⁹⁹Hg	198.968281(3) u	16.94(12) %	stable	1/2-
Isotope ²⁰⁰Hg	199.968327(3) u	23.14(9) %	stable	0+
Isotope ²⁰¹Hg	200.970303(5) u	13.17(9) %	stable	3/2-
Isotope ²⁰²Hg	201.970643(5) u	29.74(13) %	stable	0+
Isotope ²⁰⁴Hg	203.973494(3) u	6.82(4) %	stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 122) and isobaric (same nucleon number A = 202) with Mercury-202. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 122	Isobar A = 202
74	¹⁹⁶W
75	¹⁹⁷Re
76	¹⁹⁸Os	²⁰²Os
77	¹⁹⁹Ir	²⁰²Ir
78	²⁰⁰Pt	²⁰²Pt
79	²⁰¹Au	²⁰²Au
80	²⁰²Hg	²⁰²Hg
81	²⁰³Tl	²⁰²Tl
82	²⁰⁴Pb	²⁰²Pb
83	²⁰⁵Bi	²⁰²Bi
84	²⁰⁶Po	²⁰²Po
85	²⁰⁷At	²⁰²At
86	²⁰⁸Rn	²⁰²Rn
87	²⁰⁹Fr	²⁰²Fr
88	²¹⁰Ra	²⁰²Ra
89	²¹¹Ac
90	²¹²Th
91	²¹³Pa
92	²¹⁴U