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Latest Articles

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Most Popular

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.

Nernst Equation

Corrects standard electrode potentials for nonstandard conditions.

Amphiprotism

Ability of a substance to exhibit amphiprotism by accepting donated protons.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Osmotic Pressure

The hydrostatic pressure produced on the surface of a semipermable membrane by osmosis.

Equilibrium or Chemical Equilibrium

A state of dynamic balance in which the rates of forward and reverse reactions are equal, the state of a system when neither forward or reverse reaction is thermodynamically favored.

Octahedral

A term used to describe molecules and polyatomic ions that have one atom in the center and six atoms at the corners of a octahedron.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.