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Scandium is a chemical element with the symbol Sc and atomic number 21. It is a silvery-white metallic d-block element. Historically, it has been classified as a rare-earth element, [9] together with yttrium and the lanthanides. It was discovered in 1879 by spectral analysis of the minerals euxenite and gadolinite from Scandinavia. [10]
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.
The reaction of scandium trichloride with two equivalents of sodium cyclopentadienide (NaCp) produces the chloride-bridged dimer: 2 ScCl 3 + 4 NaCp → [Cp 2 Sc(μ-Cl)] 2 + 4 NaCl. Cp 3 Sc is a polymer wherein one third of the Cp ligands serving as bridging ligands. [5] Bulkier cyclopentadienide ligands give monoscandium derivatives, e.g. (C 5 ...
Bangladesh Petroleum Corporation [1] Eastern Refinery Limited , or ERL , is a state-owned oil refinery in Bangladesh . ERL, a subsidiary of Bangladesh Petroleum Corporation , supplies around 40% of the country's current petroleum products demand and thus maintains stability in the petroleum, oil, and lubricants (POL) products market of the country.
To meet the growing demand of urea fertiliser, steps have been taken by the Govt. of Bangladesh (GOB) to set up a modern technology based, energy efficient and environment friendly granular urea fertiliser factory named Shahjalal Fertilizer Project (SFP) with an annual capacity of 580,800 MT at Fenchuganj.
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Scandium-44 (44 Sc) is a radioactive isotope of scandium that decays by positron emission to stable 44 Ca with a half-life of 4.042 hours. 44 Sc can be obtained as a daughter radionuclide of long-lived 44 Ti (t 1/2 60.4 a) from 44 Ti / 44 Sc generator or can be produced by nuclear reaction 44 Ca ( p, n) 44 Sc in small cyclotrons.
Download as PDF; Printable version; In other projects Wikidata item; ... Pages in category "Scandium minerals" The following 7 pages are in this category, out of 7 ...