Flerovium-290

Properties and data of the isotope ²⁹⁰Fl.

Content

Flerovium-290 is a radioisotope of the chemical element flerovium, which, in addition to the element-specific 114 protons, has 176 neutrons in the atomic nucleus, resulting in the mass number 290. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with ²⁹⁰Fl is for academic purposes only. The official confirmation of the detection of this isotope is still pending.

General data

Name of the isotope:Flerovium-290; Fl-290Symbol:²⁹⁰Fl or 290114FlMass number A:290 (= number of nucleons)Atomic number Z:114 (= number of protons)Neutrons N:176Isotopic mass:290.19188(75) u (atomic weight of Flerovium-290)Nuclide mass:290.1293529 u (calculated nuclear mass without electrons)Mass excess:178.73507 MeVMass defect:2.225198864 u (per nucleus)Nuclear binding energy:2072.75939062 MeV (per nucleus)
7.14744617 MeV (average binding energy per nucleon)Separation energy:S_N = 6.806(867) MeV (first neutron)
S_P = 4.109(861) MeV (first proton)Half-life:19 sDecay constant λ:0.036481430555787 s^-1Specific activity α:7.575734950998 × 10⁺¹⁹ Bq g^-1
2047495932.7022 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2016

Radioactive Decay

Half-life T_½ = 19 s respectively 1.9 × 10¹ seconds s.

Decay mode	Daughter	Decay energy
EE	²⁹⁰Nh	0.416(843) MeV
SZ	div
α	²⁸⁶Cn	9,856(30) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 176) and isobaric (same nucleon number A = 290) with Flerovium-290. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.