Radon-210
Properties and data of the isotope 210Rn.
See also: List of individual Radon isotopes (and general data sources).
General data
Name of the isotope:Radon-210; Rn-210Symbol:210Rn or 21086RnMass number A:210 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:124Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4418604651163 (= neutron-proton ratio)Neutron excess (N-Z):38Isotopic mass:209.989689(5) u (atomic weight of Radon-210)Nuclide mass:209.9425168 u (calculated nuclear mass without electrons)Mass excess:-9.60463 MeVMass defect:1.757713336 u (per nucleus)Nuclear binding energy:1637.2994262 MeV (per nucleus)
7.79666393 MeV (average binding energy per nucleon)Separation energy:SN = 8.735(11) MeV (first neutron)
SP = 4.011(7) MeV (first proton)Half-life:2.4(1) hDecay constant λ:8.022536812036 × 10-5 s-1Specific activity α:2.311619461057 × 10+17 Bq g-1
6247620.1650214 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.5813(177) femtometer fmYear of discovery:1952
Radioactive Decay
Half-life T½ = 2.4(1) h (hours) respectively 8.640 × 103 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 206Po | 96(1) % | 6.1590(22) MeV | |
| EC/β+ | 210At | 4(1) % | 2.367(9) MeV | |
Parent Nuclides
Direct parent isotopes are: 214Ra, 210Fr.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 210m1Rn | 1664.6(1) keV | 644(40) ns | (8+) |
| 210m2Rn | 3812.40(16) keV | 1.06(5) μs | (17)- |
| 210m3Rn | 6469.02(21) keV | 1.04(7) μs | (23)+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 124) and isobaric (same nucleon number A = 210) with Radon-210. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 124 | Isobar A = 210 |
|---|
| 75 | 199Re | |
| 76 | 200Os | |
| 77 | 201Ir | |
| 78 | 202Pt | |
| 79 | 203Au | 210Au |
| 80 | 204Hg | 210Hg |
| 81 | 205Tl | 210Tl |
| 82 | 206Pb | 210Pb |
| 83 | 207Bi | 210Bi |
| 84 | 208Po | 210Po |
| 85 | 209At | 210At |
| 86 | 210Rn | 210Rn |
| 87 | 211Fr | 210Fr |
| 88 | 212Ra | 210Ra |
| 89 | 213Ac | 210Ac |
| 90 | 214Th | 210Th |
| 91 | 215Pa | 210Pa |
| 92 | 216U | |
External data and identifiers
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/radon-210
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