Radon-211

Properties and data of the isotope ²¹¹Rn.

Contents

General Data

Radioactive Decay

Parent Nuclides

NMR Data

Isotones und Isobares

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

General data

Name of the isotope:Radon-211; Rn-211Symbol:²¹¹Rn or 21186RnMass number A:211 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:125Isotopic mass:210.990601(7) u (atomic weight of Radon-211)Nuclide mass:210.9434288 u (calculated nuclear mass without electrons)Mass excess:-8.75511 MeVMass defect:1.765466252 u (per nucleus)Nuclear binding energy:1644.52122094 MeV (per nucleus)
7.79393944 MeV (average binding energy per nucleon)Separation energy:S_N = 7.222(8) MeV (first neutron)
S_P = 4.072(10) MeV (first proton)Half-life:14.6(2) hDecay constant λ:1.318773174581 × 10^-5 s^-1Specific activity α:3.781827533159 × 10⁺¹⁶ Bq g^-1
1022115.5495025 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μ_N) = + 0.601(7)Charge radius:5.5850(176) femtometer fmYear of discovery:1952

Radioactive Decay

Half-life T_½ = 14.6(2) h (hours) respectively 5.2560 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁰⁷Po	27.4(17) %	5.9654(14) MeV
EC/β⁺	²¹¹At	72.6(17) %	2.892(7) MeV

Parent Nuclides

Direct parent isotopes are: ²¹⁵Ra, ²¹¹Fr.

NMR data

Nuclear magnetic properties of the NMR active Nuclide ²¹¹Rn

Isotope:²¹¹Rn-NMRQuantity:Does not occur in nature!Spin:1/2-Nuclearmagnetic moment
μ/μ_N:+ 0.601(7)Nuclear g-factor:g_l = 1.202Resonance frequency:v₀ = 9.16 at 1 TRelative Sensitivity:0.00997 (H₀ = const.)
0.2152 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 125) and isobaric (same nucleon number A = 211) with Radon-211. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 125	Isobar A = 211
76	²⁰¹Os
77	²⁰²Ir
78	²⁰³Pt
79	²⁰⁴Au
80	²⁰⁵Hg	²¹¹Hg
81	²⁰⁶Tl	²¹¹Tl
82	²⁰⁷Pb	²¹¹Pb
83	²⁰⁸Bi	²¹¹Bi
84	²⁰⁹Po	²¹¹Po
85	²¹⁰At	²¹¹At
86	²¹¹Rn	²¹¹Rn
87	²¹²Fr	²¹¹Fr
88	²¹³Ra	²¹¹Ra
89	²¹⁴Ac	²¹¹Ac
90	²¹⁵Th	²¹¹Th
91	²¹⁶Pa
92	²¹⁷U