Radon-214m

Properties and data of the isotope ^214mRn.

Contents

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

General data

Name of the isotope:Radon-214m; Rn-214mSymbol:^214mRn or 214m86RnMass number A:214 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:128Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4883720930233 (= neutron-proton ratio)Neutron excess (N-Z):42Excitation energy:4595.4 keVIsotopic mass:213.995363(10) u (atomic weight of Radon-214m)Nuclide mass:213.9481908 u (calculated nuclear mass without electrons)Mass excess:-4.31934 MeVMass defect:1.786699 u (per nucleus)Nuclear binding energy:1664.29939831 MeV (per nucleus)
7.77709999 MeV (average binding energy per nucleon)Half-life:245(30) nsDecay constant λ:2829172.1655508 s^-1Specific activity α:7.99890765162 × 10⁺²⁷ Bq g^-1
2.161866932871 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(22+)

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
²¹⁴Rn		0.27(2) μs	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 128) and isobaric (same nucleon number A = 214) with Radon-214m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 128	Isobar A = 214
77	²⁰⁵Ir
78	²⁰⁶Pt
79	²⁰⁷Au
80	²⁰⁸Hg	²¹⁴Hg
81	²⁰⁹Tl	²¹⁴Tl
82	²¹⁰Pb	²¹⁴Pb
83	²¹¹Bi	²¹⁴Bi
84	²¹²Po	²¹⁴Po
85	²¹³At	²¹⁴At
86	²¹⁴Rn	²¹⁴Rn
87	²¹⁵Fr	²¹⁴Fr
88	²¹⁶Ra	²¹⁴Ra
89	²¹⁷Ac	²¹⁴Ac
90	²¹⁸Th	²¹⁴Th
91	²¹⁹Pa	²¹⁴Pa
92	²²⁰U	²¹⁴U
93	²²¹Np
95	²²³Am