Radon-216

Properties and data of the isotope ²¹⁶Rn.

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-216; Rn-216Symbol:²¹⁶Rn or 21686RnMass number A:216 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:130Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.5116279069767 (= neutron-proton ratio)Neutron excess (N-Z):44Isotopic mass:216.000271(6) u (atomic weight of Radon-216)Nuclide mass:215.9530988 u (calculated nuclear mass without electrons)Mass excess:0.25243 MeVMass defect:1.799120832 u (per nucleus)Nuclear binding energy:1675.87026028 MeV (per nucleus)
7.75865861 MeV (average binding energy per nucleon)Separation energy:S_N = 6.65(1) MeV (first neutron)
S_P = 5.780(9) MeV (first proton)Half-life:45(5) μsDecay constant λ:15403.27067911 s^-1Specific activity α:4.294475265432 × 10⁺²⁵ Bq g^-1
1.160668990657 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1949

Radioactive Decay

Half-life T_½ = 45(5) μs respectively 4.5 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²¹²Po	100 %	8.197(9)

Parent Nuclides

Direct parent isotopes are: ²²⁰Ra, ²¹⁶At.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 130) and isobaric (same nucleon number A = 216) with Radon-216. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 130	Isobar A = 216
78	²⁰⁸Pt
79	²⁰⁹Au
80	²¹⁰Hg	²¹⁶Hg
81	²¹¹Tl	²¹⁶Tl
82	²¹²Pb	²¹⁶Pb
83	²¹³Bi	²¹⁶Bi
84	²¹⁴Po	²¹⁶Po
85	²¹⁵At	²¹⁶At
86	²¹⁶Rn	²¹⁶Rn
87	²¹⁷Fr	²¹⁶Fr
88	²¹⁸Ra	²¹⁶Ra
89	²¹⁹Ac	²¹⁶Ac
90	²²⁰Th	²¹⁶Th
91	²²¹Pa	²¹⁶Pa
92	²²²U	²¹⁶U
93	²²³Np