Mercury-206

Properties and data of the isotope ²⁰⁶Hg.

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-206; Hg-206Symbol:²⁰⁶Hg or 20680HgMass number A:206 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:126Isotopic mass:205.977514(22) u (atomic weight of Mercury-206)Nuclide mass:205.9336324 u (calculated nuclear mass without electrons)Mass excess:-20.94557 MeVMass defect:1.740267976 u (per nucleus)Nuclear binding energy:1621.04917804 MeV (per nucleus)
7.86917077 MeV (average binding energy per nucleon)Separation energy:S_N = 6.729(21) MeV (first neutron)
S_P = 9.46(20) MeV (first proton)Half-life:8.32(7) minDecay constant λ:0.0013885159866986 s^-1Specific activity α:4.078945784474 × 10⁺¹⁸ Bq g^-1
110241777.95878 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4837(40) femtometer fmYear of discovery:1961

Radioactive Decay

Half-life T_½ = 8.32(7) min (minutes) respectively 4.992 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁰⁶Tl	100 %	1.308(20) MeV

Parent Nuclides

Direct parent isotope is: ²¹⁰Pb.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 126) and isobaric (same nucleon number A = 206) with Mercury-206. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 126	Isobar A = 206
76	²⁰²Os
77	²⁰³Ir
78	²⁰⁴Pt	²⁰⁶Pt
79	²⁰⁵Au	²⁰⁶Au
80	²⁰⁶Hg	²⁰⁶Hg
81	²⁰⁷Tl	²⁰⁶Tl
82	²⁰⁸Pb	²⁰⁶Pb
83	²⁰⁹Bi	²⁰⁶Bi
84	²¹⁰Po	²⁰⁶Po
85	²¹¹At	²⁰⁶At
86	²¹²Rn	²⁰⁶Rn
87	²¹³Fr	²⁰⁶Fr
88	²¹⁴Ra	²⁰⁶Ra
89	²¹⁵Ac	²⁰⁶Ac
90	²¹⁶Th
91	²¹⁷Pa
92	²¹⁸U
93	²¹⁹Np