Mercury-210m2

Properties and data of the isotope ^210m2Hg.

Contents

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

General data

Name of the isotope:Mercury-210m2; Hg-210m2Symbol:^210m2Hg or 210m280HgMass number A:210 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:130Isotopic mass:209.99424(21) u (atomic weight of Mercury-210m2)
Excitation energy: 1366+x keVNuclide mass:209.9503584 u (calculated nuclear mass without electrons)Mass excess:-5.36541 MeVMass defect:1.75820164 u (per nucleus)Nuclear binding energy:1637.75427845 MeV (per nucleus)
7.7988299 MeV (average binding energy per nucleon)Half-life:2(1) μsDecay constant λ:346573.59027997 s^-1Specific activity α:9.986196071770 × 10⁺²⁶ Bq g^-1
2.698971911289 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)(8+)

Radioactive Decay

Half-life T_½ = 2(1) μs respectively 2 × 10^-6 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	²¹⁰Hg	100 %

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
²¹⁰Hg			0+
^210m1Hg	663 keV	2.1(7) μs	(3-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 130) and isobaric (same nucleon number A = 210) with Mercury-210m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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