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Region or volume in space in which the probability of finding electrons is highest.

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Alkylbenzene

A compound containing an alkyl group bonded to a benzene ring.

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Crystal Field Theory

Theory of bonding in transition metal complexes in which ligands and metal ions are treated as point charges, a purely ionic model, ligand point charges represent the crystal (electrical) field perturbing the metal?s d orbitals containing nonbonding electrons.

Ether

Compound in which an oxygen atom is bonded to two alkyl or two aryl groups, or one alkyl and one aryl group.

Excited State

Any state other than the ground state of an atom or molecule.

Salt and its use in everyday life

Cooking salt is a product that is available in every kitchen, and it’s not as simple as it seems. The history of this product shows that it was valued like gold.

Supercritical Fluid

A substance at temperature above its critical temperature.

Binary Compound

A compound consisting of two elements, may be ionic or covalent.

yttrium

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.

High Spin Complex

Crystal field designation for an outer orbital complex, all t2g and eg orbitals are singly occupied before any pairing occurs.