Mercury-204

Properties and data of the isotope ²⁰⁴Hg.

Contents

General data

Name of the isotope:Mercury-204; Hg-204Symbol:²⁰⁴Hg or 20480HgMass number A:204 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:124Isotopic mass:203.973494(3) u (atomic weight of Mercury-204)Nuclide mass:203.9296124 u (calculated nuclear mass without electrons)Mass excess:-24.69018 MeVMass defect:1.726958144 u (per nucleus)Nuclear binding energy:1608.65114939 MeV (per nucleus)
7.88554485 MeV (average binding energy per nucleon)Separation energy:S_N = 7.4922(16) MeV (first neutron)
S_P = 8.836(3) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.4744(36) femtometer fmYear of discovery:1920

Parent Nuclides

Direct parent isotopes are: ²⁰⁴Tl, ²⁰⁴Au.

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 = 124) and isobaric (same nucleon number A = 204) with Mercury-204. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 124	Isobar A = 204
75	¹⁹⁹Re
76	²⁰⁰Os
77	²⁰¹Ir	²⁰⁴Ir
78	²⁰²Pt	²⁰⁴Pt
79	²⁰³Au	²⁰⁴Au
80	²⁰⁴Hg	²⁰⁴Hg
81	²⁰⁵Tl	²⁰⁴Tl
82	²⁰⁶Pb	²⁰⁴Pb
83	²⁰⁷Bi	²⁰⁴Bi
84	²⁰⁸Po	²⁰⁴Po
85	²⁰⁹At	²⁰⁴At
86	²¹⁰Rn	²⁰⁴Rn
87	²¹¹Fr	²⁰⁴Fr
88	²¹²Ra	²⁰⁴Ra
89	²¹³Ac	²⁰⁴Ac
90	²¹⁴Th
91	²¹⁵Pa
92	²¹⁶U