Flerovium-286

Properties and data of the isotope ²⁸⁶Fl.

Content

Flerovium-286 is a radioisotope of the chemical element flerovium, which, in addition to the element-specific 114 protons, has 172 neutrons in the atomic nucleus, resulting in the mass number 286. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with ²⁸⁶Fl is for academic purposes only.

General data

Name of the isotope:Flerovium-286; Fl-286Symbol:²⁸⁶Fl or 286114FlMass number A:286 (= number of nucleons)Atomic number Z:114 (= number of protons)Neutrons N:172Isotopic mass:286.18423(59) u (atomic weight of Flerovium-286)Nuclide mass:286.1217029 u (calculated nuclear mass without electrons)Mass excess:171.60914 MeVMass defect:2.1981892 u (per nucleus)Nuclear binding energy:2047.60005066 MeV (per nucleus)
7.15944074 MeV (average binding energy per nucleon)Separation energy:S_N = 7.398(682) MeV (first neutron)
S_P = 3.451(950) MeV (first proton)Half-life:0.166 sDecay constant λ:4.1755854250599 s^-1Specific activity α:8.792294965877 × 10⁺²¹ Bq g^-1
237629593672.36 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2004

Radioactive Decay

Half-life T_½ = 0.166 s respectively 1.66 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
SF	div	40 %
α	²⁸²Cn	60 %	10.335(41) MeV

Occurrence

Comparison of the natural Flerovium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Flerovium Isotopic mixture	289.19042 u	100 %
Isotope ²⁸⁶Fl	286.18423(59) u	100 %	0.166 s	0+
Isotope ²⁸⁹Fl	289.19052(55) u	100 %	2.4 s	5/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 172) and isobaric (same nucleon number A = 286) with Flerovium-286. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.