Nihonium-285

Properties and data of the isotope ²⁸⁵Nh.

Contents

General data

Name of the isotope:Nihonium-285; Nh-285Symbol:²⁸⁵Nh or 285113NhMass number A:285 (= number of nucleons)Atomic number Z:113 (= number of protons)Neutrons N:172Isotopic mass:285.18011(83) u (atomic weight of Nihonium-285)Nuclide mass:285.1181313 u (calculated nuclear mass without electrons)Mass excess:167.77138 MeVMass defect:2.194484168 u (per nucleus)Nuclear binding energy:2044.14883559 MeV (per nucleus)
7.17245205 MeV (average binding energy per nucleon)Separation energy:S_N = 6.894(941) MeV (first neutron)
S_P = 1.936(1087) MeV (first proton)Half-life:0.93 sDecay constant λ:0.74531954898919 s^-1Specific activity α:1.574883968307 × 10⁺²¹ Bq g^-1
42564431575.889 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2010

Radioactive Decay

Half-life T_½ = 0.93 s respectively 9.3 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁸¹Rg	> 95 %	10.010(40) MeV
SF	div	< 5 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 172) and isobaric (same nucleon number A = 285) with Nihonium-285. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.