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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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Enantiomer

One of the two mirror-image forms of an optically active molecule.

Ligand

A Lewis base in a coordination compound.

Ionization Energy

The minimum amount of energy required to remove the most loosely held electron of an isolated gaseous atom or ion.

Low Spin Complex

Crystal field designation for an inner orbital complex, contains electrons paired t2g orbitals before eg orbitals are occupied in octahedral complexes.

Saccharic acid

A white, needlelike, crystalline, water-soluble solid or syrup, C6H10O8, usually made by the oxidation of cane sugar, glucose, or starch by nitric acid. Also called "Glucaric acid."

Mother Nuclide

Nuclide that undergoes nuclear decay.

Electrolysis

Process that occurs in electrolytic cells.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.

End Point

The point at which an indicator changes colour and a titration is stopped.

Electronic Transition

The transfer of an electron from one energy level to another.