Radon-194

Properties and data of the isotope ¹⁹⁴Rn.

Contents

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

General data

Name of the isotope:Radon-194; Rn-194Symbol:¹⁹⁴Rn or 19486RnMass number A:194 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:108Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2558139534884 (= neutron-proton ratio)Neutron excess (N-Z):22Isotopic mass:194.006144(18) u (atomic weight of Radon-194)Nuclide mass:193.9589718 u (calculated nuclear mass without electrons)Mass excess:5.7231 MeVMass defect:1.60261968 u (per nucleus)Nuclear binding energy:1492.8306162 MeV (per nucleus)
7.69500318 MeV (average binding energy per nucleon)Separation energy:S_N = 11.39(3) MeV (first neutron)
S_P = 1.498(27) MeV (first proton)Half-life:0.78(16) msDecay constant λ:888.65023148711 s^-1Specific activity α:2.75854477795 × 10⁺²⁴ Bq g^-1
74555264269027 Ci g^-1Spin and parity:
(nuclear angular momentum)(0+)Year of discovery:2006

Radioactive Decay

Half-life T_½ = 0.78(16) ms respectively 7.8 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁹⁰Po	~ 100 %	7.862(10) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 108) and isobaric (same nucleon number A = 194) with Radon-194. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 108	Isobar A = 194
66	¹⁷⁴Dy
67	¹⁷⁵Ho
68	¹⁷⁶Er
69	¹⁷⁷Tm
70	¹⁷⁸Yb
71	¹⁷⁹Lu
72	¹⁸⁰Hf
73	¹⁸¹Ta	¹⁹⁴Ta
74	¹⁸²W	¹⁹⁴W
75	¹⁸³Re	¹⁹⁴Re
76	¹⁸⁴Os	¹⁹⁴Os
77	¹⁸⁵Ir	¹⁹⁴Ir
78	¹⁸⁶Pt	¹⁹⁴Pt
79	¹⁸⁷Au	¹⁹⁴Au
80	¹⁸⁸Hg	¹⁹⁴Hg
81	¹⁸⁹Tl	¹⁹⁴Tl
82	¹⁹⁰Pb	¹⁹⁴Pb
83	¹⁹¹Bi	¹⁹⁴Bi
84	¹⁹²Po	¹⁹⁴Po
85	¹⁹³At	¹⁹⁴At
86	¹⁹⁴Rn	¹⁹⁴Rn