Radon-198

Properties and data of the isotope ¹⁹⁸Rn.

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-198; Rn-198Symbol:¹⁹⁸Rn or 19886RnMass number A:198 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:112Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3023255813953 (= neutron-proton ratio)Neutron excess (N-Z):26Isotopic mass:197.998679(14) u (atomic weight of Radon-198)Nuclide mass:197.9515068 u (calculated nuclear mass without electrons)Mass excess:-1.2305 MeVMass defect:1.644744344 u (per nucleus)Nuclear binding energy:1532.06948797 MeV (per nucleus)
7.73772469 MeV (average binding energy per nucleon)Separation energy:S_N = 10.812(21) MeV (first neutron)
S_P = 2.164(16) MeV (first proton)Half-life:65(3) msDecay constant λ:10.663802777845 s^-1Specific activity α:3.259843778211 × 10⁺²² Bq g^-1
881038858976.11 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1984

Radioactive Decay

Half-life T_½ = 65(3) ms respectively 6.5 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁹⁴Po	?	7.349(4) MeV
EC/β⁺	¹⁹⁸At	?	5.584(15) MeV

Parent Nuclides

Direct parent isotope is: ²⁰²Ra.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 112) and isobaric (same nucleon number A = 198) with Radon-198. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 112	Isobar A = 198
70	¹⁸²Yb
71	¹⁸³Lu
72	¹⁸⁴Hf
73	¹⁸⁵Ta
74	¹⁸⁶W
75	¹⁸⁷Re	¹⁹⁸Re
76	¹⁸⁸Os	¹⁹⁸Os
77	¹⁸⁹Ir	¹⁹⁸Ir
78	¹⁹⁰Pt	¹⁹⁸Pt
79	¹⁹¹Au	¹⁹⁸Au
80	¹⁹²Hg	¹⁹⁸Hg
81	¹⁹³Tl	¹⁹⁸Tl
82	¹⁹⁴Pb	¹⁹⁸Pb
83	¹⁹⁵Bi	¹⁹⁸Bi
84	¹⁹⁶Po	¹⁹⁸Po
85	¹⁹⁷At	¹⁹⁸At
86	¹⁹⁸Rn	¹⁹⁸Rn
87	¹⁹⁹Fr