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A positive ion, an atom or group of atoms that has lost one or more electrons.

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Adsorption

Adhesion of a species onto the surfaces of particles.

Radioactivity

The spontaneous disintegration of atomic nuclei.

Ionization

In aqueous solution, the process in which a molecular compound reacts with water and forms ions.

Heat

A form of energy that flows between two samples of matter because of their differences in temperature.

Photon

A packet of light or electromagnetic radiation, also called quantum of light.

 

Reaction Ratio

The relative amounts of reactants and products involved in a reaction, maybe the ratio of moles. millimoles, or masses.

 

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

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.

Covalent Compounds

Compounds containing predominantly covalent bonds.

Catenation

Bonding of atoms of the same element into chains or rings.
The bonding together of atoms of the same element to form chains.
The ability of an element to bond to itself.