Roentgenium-274

Properties and data of the isotope ²⁷⁴Rg.

Content

General data

Name of the isotope:Roentgenium-274; Rg-274Symbol:²⁷⁴Rg or 274111RgMass number A:274 (= number of nucleons)Atomic number Z:111 (= number of protons)Neutrons N:163Isotopic mass:274.15525(23) u (atomic weight of Roentgenium-274)Nuclide mass:274.094368 u (calculated nuclear mass without electrons)Mass excess:144.61444 MeVMass defect:2.12570986 u (per nucleus)Nuclear binding energy:1980.08598033 MeV (per nucleus)
7.22659117 MeV (average binding energy per nucleon)Separation energy:S_N = 6.344(451) MeV (first neutron)
S_P = 0.962(253) MeV (first proton)Half-life:0.012 sDecay constant λ:57.762265046662 s^-1Specific activity α:1.269534658759 × 10⁺²³ Bq g^-1
3431174753403 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2004

Radioactive Decay

Half-life T_½ = 0.012 s respectively 1.2 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁷⁰Mt	ca. 100 %	11.478(86) MeV

Parent Nuclides

Direct parent isotope is: ²⁷⁸Nh.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 163) and isobaric (same nucleon number A = 274) with Roentgenium-274. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 163	Isobar A = 274
103	²⁶⁶Lr
104	²⁶⁷Rf
105	²⁶⁸Db
106	²⁶⁹Sg
107	²⁷⁰Bh	²⁷⁴Bh
108	²⁷¹Hs	²⁷⁴Hs
109	²⁷²Mt	²⁷⁴Mt
110	²⁷³Ds	²⁷⁴Ds
111	²⁷⁴Rg	²⁷⁴Rg