Mercury-212

Properties and data of the isotope ²¹²Hg.

Contents

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

General data

Name of the isotope:Mercury-212; Hg-212Symbol:²¹²Hg or 21280HgMass number A:212 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:132Isotopic mass:212.00296(32) u (atomic weight of Mercury-212)Nuclide mass:211.9590784 u (calculated nuclear mass without electrons)Mass excess:2.75722 MeVMass defect:1.766811472 u (per nucleus)Nuclear binding energy:1645.7742853 MeV (per nucleus)
7.76308625 MeV (average binding energy per nucleon)Separation energy:S_N = 4.69(36) MeV (first neutron)Half-life:300 nsDecay constant λ:2310490.6018665 s^-1Specific activity α:6.563254650943 × 10⁺²⁷ Bq g^-1
1.773852608363 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2010

Radioactive Decay

Half-life T_½ = 300 ns respectively 3.0 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²¹²Tl	?	4.31(36) MeV
β^-, n	²¹¹Tl	?	0.76(30) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 132) and isobaric (same nucleon number A = 212) with Mercury-212. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 132	Isobar A = 212
80	²¹²Hg	²¹²Hg
81	²¹³Tl	²¹²Tl
82	²¹⁴Pb	²¹²Pb
83	²¹⁵Bi	²¹²Bi
84	²¹⁶Po	²¹²Po
85	²¹⁷At	²¹²At
86	²¹⁸Rn	²¹²Rn
87	²¹⁹Fr	²¹²Fr
88	²²⁰Ra	²¹²Ra
89	²²¹Ac	²¹²Ac
90	²²²Th	²¹²Th
91	²²³Pa	²¹²Pa
92	²²⁴U
93	²²⁵Np