Radon-206

Properties and data of the isotope ²⁰⁶Rn.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Radon isotopes (and general data sources).

General data

Name of the isotope:Radon-206; Rn-206Symbol:²⁰⁶Rn or 20686RnMass number A:206 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:120Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3953488372093 (= neutron-proton ratio)Neutron excess (N-Z):34Isotopic mass:205.990195(9) u (atomic weight of Radon-206)Nuclide mass:205.9430228 u (calculated nuclear mass without electrons)Mass excess:-9.1333 MeVMass defect:1.722547672 u (per nucleus)Nuclear binding energy:1604.54282118 MeV (per nucleus)
7.78904282 MeV (average binding energy per nucleon)Separation energy:S_N = 9.494(10) MeV (first neutron)
S_P = 3.450(17) MeV (first proton)Half-life:5.67(17) minDecay constant λ:0.0020374696665489 s^-1Specific activity α:5.985331380393 × 10⁺¹⁸ Bq g^-1
161765712.9836 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.5640(178) femtometer fmYear of discovery:1954

Radioactive Decay

Half-life T_½ = 5.67(17) min (minutes) respectively 3.402 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁰²Po	62(3) %	6.3837(16) MeV
EC/β⁺	²⁰⁶At	38(3) %	3.297(17) MeV

Parent Nuclides

Direct parent isotopes are: ²¹⁰Ra, ²⁰⁶Fr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 120) and isobaric (same nucleon number A = 206) with Radon-206. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 120	Isobar A = 206
73	¹⁹³Ta
74	¹⁹⁴W
75	¹⁹⁵Re
76	¹⁹⁶Os
77	¹⁹⁷Ir
78	¹⁹⁸Pt	²⁰⁶Pt
79	¹⁹⁹Au	²⁰⁶Au
80	²⁰⁰Hg	²⁰⁶Hg
81	²⁰¹Tl	²⁰⁶Tl
82	²⁰²Pb	²⁰⁶Pb
83	²⁰³Bi	²⁰⁶Bi
84	²⁰⁴Po	²⁰⁶Po
85	²⁰⁵At	²⁰⁶At
86	²⁰⁶Rn	²⁰⁶Rn
87	²⁰⁷Fr	²⁰⁶Fr
88	²⁰⁸Ra	²⁰⁶Ra
89	²⁰⁹Ac	²⁰⁶Ac
90	²¹⁰Th