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Scandium forms a series of organometallic compounds with cyclopentadienyl ligands (Cp), similar to the behavior of the lanthanides. One example is the chlorine-bridged dimer, [ScCp 2 Cl] 2 and related derivatives of pentamethylcyclopentadienyl ligands.
Naturally occurring scandium (21 Sc) is composed of one stable isotope, 45 Sc. Twenty-seven radioisotopes have been characterized, with the most stable being 46 Sc with a half-life of 83.8 days, 47 Sc with a half-life of 3.35 days, and 48 Sc with a half-life of 43.7 hours and 44 Sc with a half-life of 3.97 hours.
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However, the Chicago Manual of Style now recommends use of the uppercase two-letter abbreviations, with the traditional forms as an option. [17] The postal abbreviation is the same as the ISO 3166-2 subdivision code for each of the fifty states. These codes do not overlap with the 13 Canadian subnational postal abbreviations.
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DTT is a reducing agent; once oxidized, it forms a stable six-membered ring with an internal disulfide bond.It has a redox potential of −0.33 V at pH 7. [1] The reduction of a typical disulfide bond proceeds by two sequential thiol-disulfide exchange reactions and is illustrated below.