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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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Crystal Lattice

A pattern of arrangement of particles in a crystal.

Fast Neutron

A neutron ejected at high kinetic energy in a nuclear reaction.

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The study of the energy transfers accompanying physical and chemical processes.

Molecular Formula

Formula that indicates the actual number of atoms present in a molecule of a molecular substance.

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