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Naturally occurring manganese (25 Mn) is composed of one stable isotope, 55 Mn. Twenty-seven radioisotopes have been characterized, with the most stable being 53 Mn with a half-life of 3.7 million years, 54 Mn with a half-life of 312.3 days, and 52 Mn with a half-life of 5.591 days.
Radioactive isotope table "lists ALL radioactive nuclei with a half-life greater than 1000 years", incorporated in the list above. The NUBASE2020 evaluation of nuclear physics properties F.G. Kondev et al. 2021 Chinese Phys. C 45 030001. The PDF of this article lists the half-lives of all known radioactives nuclides.
Manganese is a chemical element; it has symbol Mn and atomic number 25. It is a hard, brittle, ... [15] 53 Mn decays to 53 Cr with a half-life of 3.7 million years.
In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its "first half-life", "second half-life", etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on.
Spectral lines of manganese: Other properties; Natural occurrence: primordial: Crystal structure: ... half-life (t 1/2) mode product; 52 Mn synth: 5.591 d:
Manganese (II) and iron (III) complexes are commonly used due to their high kinetic and thermodynamic stability, increasing the half-life of the mimetic. [1] However, manganese-based SOD mimetics are found to be more therapeutically effective than their counterparts due to their low toxicity, higher catalytic activity, and increased stability ...
3.1 abundance, half-life trace, synthetic, stable by keyboard code 3.2 decay mode ( β − β − ) by keyboard code 3.3 percentage abundance, decay mode formatting
Manganese is also important in photosynthetic oxygen evolution in chloroplasts in plants. The oxygen-evolving complex (OEC) is a part of photosystem II contained in the thylakoid membranes of chloroplasts; it is responsible for the terminal photooxidation of water during the light reactions of photosynthesis , and has a metalloenzyme core ...