fermium (chemistry) 鋤(化學) oor Sjinees
fermium (chemistry) 鋤(化學)
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鋤(化學) fermium
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The chemistry of fermium has only been studied in solution using tracer techniques, and no solid compounds have been prepared.
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Under normal conditions, fermium exists in solution as the Fm3+ ion, which has a hydration number of 16.9 and an acid dissociation constant of 1.6×10−4 (pKa = 3.8).
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Additional analysis and further experimentation showed the produced mendelevium isotope to have mass 256 and to decay by electron capture to fermium-256 with a half-life of 1.5 h.
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There are 20 isotopes of fermium listed in NUBASE 2016, with atomic weights of 241 to 260, of which 257Fm is the longest-lived with a half-life of 100.5 days.
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Therefore, most fermium is produced on Earth in scientific laboratories, high-power nuclear reactors, or in nuclear weapons tests, and is present only within a few months from the time of the synthesis.
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5 sinne gevind in 1 ms. Hulle kom uit baie bronne en word nie nagegaan nie.