A rare trivalent metallic element, found in gadolinite and other minerals. Symbol: Y, at. wt.: 88.905, at. no.: 39, sp. gr.: 4.47. Cf."rare-earth element."
Yttrium has a silver-metallic luster and is relatively stable in air unless finely divided. Turnings of the metal, however, ignite in air if their temperature exceeds 400oC. Yttrium oxide is one of the most important compounds of yttrium and accounts for the largest use. It is widely used in making YVO4 europium, and Y2O3 europium phosphors to give the red color in color television tubes.
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Electrodes
Surfaces upon which oxidation and reduction half-reactions, occur in electrochemical cells.
Aldehyde
Compound in which an alkyl or aryl group and a hydrogen atom are attached to a carbonyl group and a hydrogen atom are attached to a carbonyl group, general formula, O-R-C-H
Beta Particle
Electron emitted from the nucleus when a neuton decays to a proton and an electron.
Stereoisomers
Isomers that differ only in the way that atoms are oriented in space, consist of geometrical and optical isomers.
Sublimation
The direct vaporization of a sold by heating without passing through the liquid state.
Faraday
One faraday of electricity corresponds to the charge on 6.022 x 1023 electrons, or 96,487.301 coulombs.
Law of Conservation of Energy
Energy cannot be created or destroyed, it may be changed from one form to another.
Hydride
A binary compound of hydrogen.
A brief history of dyeing fabrics
Dyeing fabrics is giving the fibers a homogeneous color that has a certain degree of strength. The methods of dyeing are very diverse, depending on the properties of the dyes and the dyed fibers.
Double Salt
Solid consisting of two co-crystallized salts.
