Mercury-194

Properties and data of the isotope ¹⁹⁴Hg.

Content

General data

Name of the isotope:Mercury-194; Hg-194Symbol:¹⁹⁴Hg or 19480HgMass number A:194 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:114Isotopic mass:193.965449(3) u (atomic weight of Mercury-194)Nuclide mass:193.9215674 u (calculated nuclear mass without electrons)Mass excess:-32.18405 MeVMass defect:1.648353984 u (per nucleus)Nuclear binding energy:1535.43184597 MeV (per nucleus)
7.91459714 MeV (average binding energy per nucleon)Separation energy:S_N = 9.193(16) MeV (first neutron)
S_P = 6.068(9) MeV (first proton)Half-life:444(77) aDecay constant λ:4.951051289713 × 10^-11 s^-1Specific activity α:154486674981.5 Bq g^-1
4.1753155400405 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4309(33) femtometer fmYear of discovery:1962

Radioactive Decay

Half-life T_½ = 444(77) a respectively 1.4 × 10¹⁰ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE	¹⁹⁴Au	100 %	28(4) MeV

Parent Nuclides

Direct parent isotope is: ¹⁹⁴Tl.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 114) and isobaric (same nucleon number A = 194) with Mercury-194. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 114	Isobar A = 194
70	¹⁸⁴Yb
71	¹⁸⁵Lu
72	¹⁸⁶Hf
73	¹⁸⁷Ta	¹⁹⁴Ta
74	¹⁸⁸W	¹⁹⁴W
75	¹⁸⁹Re	¹⁹⁴Re
76	¹⁹⁰Os	¹⁹⁴Os
77	¹⁹¹Ir	¹⁹⁴Ir
78	¹⁹²Pt	¹⁹⁴Pt
79	¹⁹³Au	¹⁹⁴Au
80	¹⁹⁴Hg	¹⁹⁴Hg
81	¹⁹⁵Tl	¹⁹⁴Tl
82	¹⁹⁶Pb	¹⁹⁴Pb
83	¹⁹⁷Bi	¹⁹⁴Bi
84	¹⁹⁸Po	¹⁹⁴Po
85	¹⁹⁹At	¹⁹⁴At
86	²⁰⁰Rn	¹⁹⁴Rn
87	²⁰¹Fr
88	²⁰²Ra