Radon-210m2

Properties and data of the isotope ^210m2Rn.

Contents

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

General data

Name of the isotope:Radon-210m2; Rn-210m2Symbol:^210m2Rn or 210m286RnMass 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):38Excitation energy:3812.40(16) keVIsotopic mass:209.989689(5) u (atomic weight of Radon-210m2)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)Half-life:1.06(5) μsDecay constant λ:653912.43449051 s^-1Specific activity α:1.884187938069 × 10⁺²⁷ Bq g^-1
5.092399832621 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)(17)-Magnetic dipole moment:μ(μ_N) = 17.88(9)Quadrupole moment Q:0.86(10) barn (100 fm²)Nuclear g-factor:g_l = 1.0517647058824

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
²¹⁰Rn		2.4(1) h	0+
^210m1Rn	1664.6(1) keV	644(40) ns	(8+)
^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-210m2. 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