Roentgenium-282

Properties and data of the isotope ²⁸²Rg.

Content

General data

Name of the isotope:Roentgenium-282; Rg-282Symbol:²⁸²Rg or 282111RgMass number A:282 (= number of nucleons)Atomic number Z:111 (= number of protons)Neutrons N:171Isotopic mass:282.16934(63) u (atomic weight of Roentgenium-282)Nuclide mass:282.108458 u (calculated nuclear mass without electrons)Mass excess:157.73919 MeVMass defect:2.180939188 u (per nucleus)Nuclear binding energy:2031.53176799 MeV (per nucleus)
7.20401336 MeV (average binding energy per nucleon)Separation energy:S_N = 5.663(972) MeV (first neutron)
S_P = 2.820(767) MeV (first proton)Half-life:100 sDecay constant λ:0.0069314718055995 s^-1Specific activity α:1.480223389361 × 10⁺¹⁹ Bq g^-1
400060375.50316 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2010

Radioactive Decay

Half-life T_½ = 100 s respectively 1 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁷⁸Mt	ca. 100 %	9.550(104) MeV
SZ	div	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 171) and isobaric (same nucleon number A = 282) with Roentgenium-282. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.