Mercury-203

Properties and data of the isotope ²⁰³Hg.

Contents

General data

Name of the isotope:Mercury-203; Hg-203Symbol:²⁰³Hg or 20380HgMass number A:203 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:123Isotopic mass:202.9728723(17) u (atomic weight of Mercury-203)Nuclide mass:202.9289907 u (calculated nuclear mass without electrons)Mass excess:-25.26929 MeVMass defect:1.718914928 u (per nucleus)Nuclear binding energy:1601.15894194 MeV (per nucleus)
7.88748247 MeV (average binding energy per nucleon)Separation energy:S_N = 5.9953(16) MeV (first neutron)
S_P = 8.205(23) MeV (first proton)Half-life:46.594(12) dDecay constant λ:1.721796113670 × 10^-7 s^-1Specific activity α:5.133118182482 × 10⁺¹⁴ Bq g^-1
13873.292385089 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μ_N) = + 0.84895(13)Quadrupole moment Q:+ 0.343(36) barn (100 fm²)Nuclear g-factor:g_l = 0.33958Charge radius:5.4679(35) femtometer fmYear of discovery:1943

Radioactive Decay

Half-life T_½ = 46.594(12) d respectively 4.0257216 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁰³Tl	100 %	0.4921(12) MeV

Parent Nuclides

Direct parent isotope is: ²⁰³Au.

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
^203mHg	933.14(23) keV	24(4) μs

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 123) and isobaric (same nucleon number A = 203) with Mercury-203. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 123	Isobar A = 203
74	¹⁹⁷W
75	¹⁹⁸Re
76	¹⁹⁹Os	²⁰³Os
77	²⁰⁰Ir	²⁰³Ir
78	²⁰¹Pt	²⁰³Pt
79	²⁰²Au	²⁰³Au
80	²⁰³Hg	²⁰³Hg
81	²⁰⁴Tl	²⁰³Tl
82	²⁰⁵Pb	²⁰³Pb
83	²⁰⁶Bi	²⁰³Bi
84	²⁰⁷Po	²⁰³Po
85	²⁰⁸At	²⁰³At
86	²⁰⁹Rn	²⁰³Rn
87	²¹⁰Fr	²⁰³Fr
88	²¹¹Ra	²⁰³Ra
89	²¹²Ac	²⁰³Ac
90	²¹³Th
91	²¹⁴Pa
92	²¹⁵U