Meitnerium-275

Properties and data of the isotope ²⁷⁵Mt.

Content

General data

Name of the isotope:Meitnerium-275; Mt-275Symbol:²⁷⁵Mt or 275109MtMass number A:275 (= number of nucleons)Atomic number Z:109 (= number of protons)Neutrons N:166Isotopic mass:275.14897(42) u (atomic weight of Meitnerium-275)Nuclide mass:275.0891847 u (calculated nuclear mass without electrons)Mass excess:138.76466 MeVMass defect:2.142334544 u (per nucleus)Nuclear binding energy:1995.57177373 MeV (per nucleus)
7.25662463 MeV (average binding energy per nucleon)Separation energy:S_N = 6.554(540) MeV (first neutron)
S_P = 1.928(608) MeV (first proton)Half-life:20 msDecay constant λ:34.657359027997 s^-1Specific activity α:7.589509014545 × 10⁺²² Bq g^-1
2051218652579.9 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2004

Radioactive Decay

Half-life T_½ = 20 ms respectively 2.0 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁷¹Bh	ca. 100 %	10.483(51) MeV
SZ	div	≤ 25 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 166) and isobaric (same nucleon number A = 275) with Meitnerium-275. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 166	Isobar A = 275
107	²⁷³Bh	²⁷⁵Bh
108	²⁷⁴Hs	²⁷⁵Hs
109	²⁷⁵Mt	²⁷⁵Mt
110	²⁷⁶Ds	²⁷⁵Ds
111	²⁷⁷Rg	²⁷⁵Rg
112	²⁷⁸Cn
113	²⁷⁹Nh