Gold-210

Properties and data of the isotope ²¹⁰Au.

Content

General data

Name of the isotope:Gold-210; Au-210Symbol:²¹⁰Au or 21079AuMass number A:210 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:131Isotopic mass:210.00250(43) u (atomic weight of Gold-210)Nuclide mass:209.9591669 u (calculated nuclear mass without electrons)Mass excess:2.32873 MeVMass defect:1.750781524 u (per nucleus)Nuclear binding energy:1630.84248492 MeV (per nucleus)
7.76591659 MeV (average binding energy per nucleon)Separation energy:S_N = 3.20(57) MeV (first neutron)Half-life:300 nsDecay constant λ:2310490.6018665 s^-1Specific activity α:6.625761838095 × 10⁺²⁷ Bq g^-1
1.790746442728 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2010

Radioactive Decay

Half-life T_½ = 300 ns respectively 3.0 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²¹⁰Hg	?	7.69(45) MeV
β^-, n	²⁰⁹Hg	?	2.90(43) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 131) and isobaric (same nucleon number A = 210) with Gold-210. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 131	Isobar A = 210
79	²¹⁰Au	²¹⁰Au
80	²¹¹Hg	²¹⁰Hg
81	²¹²Tl	²¹⁰Tl
82	²¹³Pb	²¹⁰Pb
83	²¹⁴Bi	²¹⁰Bi
84	²¹⁵Po	²¹⁰Po
85	²¹⁶At	²¹⁰At
86	²¹⁷Rn	²¹⁰Rn
87	²¹⁸Fr	²¹⁰Fr
88	²¹⁹Ra	²¹⁰Ra
89	²²⁰Ac	²¹⁰Ac
90	²²¹Th	²¹⁰Th
91	²²²Pa
92	²²³U