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

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Optical Isomers

Stereoisomers that differ only by being nonsuperimposable mirror images of each other, like right and left hands, also called enantiomers.

Bond Order

Half the numbers of electrons in bonding orbitals minus half the number of electrons in antibonding orbitals. Bond order gives an indication to the stability of a bond. Also defined as the difference between the number of bonding electrons and antibonding electrons divided by two.

Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

Radioactive Tracer

A small amount of radioisotope replacing a nonradioactive isotope of the element in a compound whose path (for example, in the body) or whose decomposition products are to be monitored by detection of radioctivity, also called a radioactive label.

Carcinogen

A substance capable of causing or producing cancer in mammals.

 

Hydrolysis

The reaction of a substance with water or its ions.

Amine Complexes

Complex species that contain ammonia molecules bonded to metal ions.

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Spectrum

Display of component wavelengths (colours) of electromagnetic radiation.

Linkage Isomers

Isomers in which a particular ligand bonds to a metal ion through different donor atoms.