Radon-219

Properties and data of the isotope ²¹⁹Rn.

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-219; Rn-219Other names:ActinonSymbol:²¹⁹Rn or 21986RnMass number A:219 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:133Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.546511627907 (= neutron-proton ratio)Neutron excess (N-Z):47Isotopic mass:219.0094788(23) u (atomic weight of Radon-219)Nuclide mass:218.9623066 u (calculated nuclear mass without electrons)Mass excess:8.82945 MeVMass defect:1.81590778 u (per nucleus)Nuclear binding energy:1691.50720162 MeV (per nucleus)
7.72377718 MeV (average binding energy per nucleon)Separation energy:S_N = 4.459(3) MeV (first neutron)
S_P = 6.558(12) MeV (first proton)Half-life:3.96(1) sDecay constant λ:0.17503716680807 s^-1Specific activity α:4.813235042202 × 10⁺²⁰ Bq g^-1
13008743357.305 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μ_N) = - 0.442(5)Quadrupole moment Q:1.15(12) barn (100 fm²)Nuclear g-factor:g_l = -0.1768Charge radius:5.6648(191) femtometer fmYear of discovery:1903

Radioactive Decay

Half-life T_½ = 3.96(1) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²¹⁵Po	100 %	6.9462(3) MeV

Parent Nuclides

Direct parent isotopes are: ²²³Ra, ²¹⁹At.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 133) and isobaric (same nucleon number A = 219) with Radon-219. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 133	Isobar A = 219
80	²¹³Hg
81	²¹⁴Tl
82	²¹⁵Pb	²¹⁹Pb
83	²¹⁶Bi	²¹⁹Bi
84	²¹⁷Po	²¹⁹Po
85	²¹⁸At	²¹⁹At
86	²¹⁹Rn	²¹⁹Rn
87	²²⁰Fr	²¹⁹Fr
88	²²¹Ra	²¹⁹Ra
89	²²²Ac	²¹⁹Ac
90	²²³Th	²¹⁹Th
91	²²⁴Pa	²¹⁹Pa
92	²²⁵U	²¹⁹U
93	²²⁶Np	²¹⁹Np