Mercury-184

Properties and data of the isotope ¹⁸⁴Hg.

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-184; Hg-184Symbol:¹⁸⁴Hg or 18480HgMass number A:184 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:104Isotopic mass:183.971713(11) u (atomic weight of Mercury-184)Nuclide mass:183.9278314 u (calculated nuclear mass without electrons)Mass excess:-26.34917 MeVMass defect:1.555440824 u (per nucleus)Nuclear binding energy:1448.88379491 MeV (per nucleus)
7.87436845 MeV (average binding energy per nucleon)Separation energy:S_N = 10.616(12) MeV (first neutron)
S_P = 3.446(14) MeV (first proton)Half-life:30.87(26) sDecay constant λ:0.022453747345641 s^-1Specific activity α:7.389050784091 × 10⁺¹⁹ Bq g^-1
1997040752.4573 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.3949(47) femtometer fmYear of discovery:1969

Radioactive Decay

Half-life T_½ = 30.87(26) s respectively 3.087 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁸⁰Pt	1.11(6) %	5.662(4) MeV
EC/β⁺	¹⁸⁴Au	90.89(6) %	3.970(24) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁸⁸Pb, ¹⁸⁴Tl.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 104) and isobaric (same nucleon number A = 184) with Mercury-184. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 104	Isobar A = 184
62	¹⁶⁶Sm
63	¹⁶⁷Eu
64	¹⁶⁸Gd
65	¹⁶⁹Tb
66	¹⁷⁰Dy
67	¹⁷¹Ho
68	¹⁷²Er
69	¹⁷³Tm
70	¹⁷⁴Yb	¹⁸⁴Yb
71	¹⁷⁵Lu	¹⁸⁴Lu
72	¹⁷⁶Hf	¹⁸⁴Hf
73	¹⁷⁷Ta	¹⁸⁴Ta
74	¹⁷⁸W	¹⁸⁴W
75	¹⁷⁹Re	¹⁸⁴Re
76	¹⁸⁰Os	¹⁸⁴Os
77	¹⁸¹Ir	¹⁸⁴Ir
78	¹⁸²Pt	¹⁸⁴Pt
79	¹⁸³Au	¹⁸⁴Au
80	¹⁸⁴Hg	¹⁸⁴Hg
81	¹⁸⁵Tl	¹⁸⁴Tl
82	¹⁸⁶Pb	¹⁸⁴Pb
83	¹⁸⁷Bi	¹⁸⁴Bi
84	¹⁸⁸Po
85	¹⁸⁹At