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Lewis structure of a water molecule. Lewis structures – also called Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs) – are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
In all four halides, the scandium is 6-coordinated. They can be prepared by reacting scandium oxide or scandium hydroxide with the corresponding acid: [3] Sc(OH) 3 + 3 HX → ScX 3 + 3 H 2 O. The halides are Lewis acids; for example, ScF 3 dissolves in a solution containing excess fluoride ion to form [ScF 6] 3−. The coordination number 6 is ...
It is composed of the scandium cation and the nitride anion. It forms crystals that can be grown on tungsten foil through sublimation and recondensation . [ 1 ] It has a rock-salt crystal structure with lattice constant of 0.451 nanometer , an indirect bandgap of 0.9 eV and direct bandgap of 2 to 2.4 eV.
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]
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Structure of trans-[Sc(H 2 O) 4 Cl 2] +.. ScCl 3 is a Lewis acid that absorbs water to give aquo complexes.According to X-ray crystallogrphy, one such hydrate is the salt trans-[ScCl 2 (H 2 O) 4]Cl·2H 2 O. [5] With the less basic ligand tetrahydrofuran, ScCl 3 yields the adduct ScCl 3 (THF) 3 as white crystals.
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Scandium(III) oxide or scandia is a inorganic compound with formula Sc 2 O 3.It is one of several oxides of rare earth elements with a high melting point.It is used in the preparation of other scandium compounds as well as in high-temperature systems (for its resistance to heat and thermal shock), electronic ceramics, and glass composition (as a helper material).