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Silicon monoxide is the chemical compound with the formula SiO where silicon is present in the oxidation state +2. In the vapour phase, it is a diatomic molecule. [ 1 ] It has been detected in stellar objects [ 2 ] and has been described as the most common oxide of silicon in the universe.
It is 180° in coesite (another polymorph of SiO 2), in Ph 3 Si–O–SiPh 3, [17] and in the [O 3 Si–O–SiO 3] 6− ion in thortveitite, Sc 2 Si 2 O 7. It increases progressively from 133° to 180° in Ln 2 Si 2 O 7 as the size and coordination number of the lanthanide decreases from neodymium to lutetium.
3 NMe 2 + Me 2 NH 2 Br 4 SiH 3 I + 5 N 2 H 4 → (SiH 3) 2 NN(SiH 3) 2 + 4 N 2 H 5 I. Many such compounds have been prepared, the only known restriction being that the nitrogen is always tertiary, and species containing the SiH–NH group are unstable at room temperature. The stoichiometry around the nitrogen atom in compounds such as N(SiH 3 ...
Again there is variation in composition: magnesium silicide is represented by Mg 2 Si, [9] calcium silicide can be represented by Ca 2 Si, CaSi, CaSi 2, Ca 5 Si 3 and by Ca 14 Si 19, [10] strontium silicide can be represented by Sr 2 Si, SrSi 2 and Sr 5 Si 3 [11] and barium silicide can be represented by Ba 2 Si, BaSi 2, Ba 5 Si 3 and Ba 3 Si 4 ...
VO is a non-stoichiometric compound, its composition varying from VO 0.8 to VO 1.3. [2] Diatomic VO is one of the molecules found in the spectrum of relatively cool M-type stars. [3] A potential use of vanadium(II) monoxide is as a molecular vapor in synthetic chemical reagents in low-temperature matrices. [4]
Suboxides are sometimes visible when certain metals are exposed to small amounts of O 2: 22 Cs + 3 O 2 → 2 Cs 11 O 3 4 Cs 11 O 3 + 5 O 2 → 22 Cs 2 O. Several suboxides of caesium and rubidium have been characterized by X-ray crystallography. As of 1997, the inventory includes the following Rb 9 O 2, Rb 6 O, Cs 11 O 3, Cs 4 O, Cs 7 O, Cs 11 ...
Its usage varies from about 30 to 50 kilograms (65–110 lb) per ton of steel. The quicklime neutralizes the acidic oxides, SiO 2, Al 2 O 3, and Fe 2 O 3, to produce a basic molten slag. [10] Ground quicklime is used in the production of aerated concrete such as blocks with densities of ca. 0.6–1.0 g/cm 3 (9.8–16.4 g/cu in). [10]
3] 2−). Germanium occurs mostly in the oxidation state +4 although many +2 compounds are known. [1] Other oxidation states are rare: +3 is found in compounds such as Ge 2 Cl 6, and +3 and +1 are found on the surface of oxides, [2] or negative oxidation states in germanides, such as −4 in Mg 2 Ge.