Radon-227

Properties and data of the isotope ²²⁷Rn.

Contents

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

General data

Name of the isotope:Radon-227; Rn-227Symbol:²²⁷Rn or 22786RnMass number A:227 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:141Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.6395348837209 (= neutron-proton ratio)Neutron excess (N-Z):55Isotopic mass:227.035304(15) u (atomic weight of Radon-227)Nuclide mass:226.9881318 u (calculated nuclear mass without electrons)Mass excess:32.88546 MeVMass defect:1.859401908 u (per nucleus)Nuclear binding energy:1732.02172089 MeV (per nucleus)
7.63005163 MeV (average binding energy per nucleon)Separation energy:S_N = 3.933(18) MeV (first neutron)
S_P = 9.02(30) MeV (first proton)Half-life:20.2(4) sDecay constant λ:0.034314216859403 s^-1Specific activity α:9.103306053997 × 10⁺¹⁹ Bq g^-1
2460352987.5669 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2)Year of discovery:1986

Radioactive Decay

Half-life T_½ = 20.2(4) s respectively 2.02 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²²⁷Fr	100 %	3.203(15) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 141) and isobaric (same nucleon number A = 227) with Radon-227. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 141	Isobar A = 227
83	²²⁴Bi
84	²²⁵Po	²²⁷Po
85	²²⁶At	²²⁷At
86	²²⁷Rn	²²⁷Rn
87	²²⁸Fr	²²⁷Fr
88	²²⁹Ra	²²⁷Ra
89	²³⁰Ac	²²⁷Ac
90	²³¹Th	²²⁷Th
91	²³²Pa	²²⁷Pa
92	²³³U	²²⁷U
93	²³⁴Np	²²⁷Np
94	²³⁵Pu
95	²³⁶Am
96	²³⁷Cm
97	²³⁸Bk
98	²³⁹Cf
99	²⁴⁰Es
100	²⁴¹Fm