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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.

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Atom

The smallest particle of an element.

Alkylbenzene

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

Reaction Stoichiometry

Description of the quantitative relationships among substances as they participate in chemical reactions.

Temperature

A measure of the intensity of heat, i.e. the hotness or coldness of a sample. or object.

Gamma Ray

High energy electromagnetic radiation. A highly penetrating type of nuclear radiation similar to x-ray radiation, except that it comes from within the nucleus of an atom and has a higher energy. Energywise, very similar to cosmic ray except that cosmic rays originate from outer space.

Electron Configuration

Specific distribution of electrons in atomic orbitals of atoms or ions.

Donor Atom

A ligand atom whose electrons are shared with a Lewis acid.

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Electrode Potentials

Potentials, E, of half-reactions as reductions versus the standard hydrogen electrode.

Molecule

The smallest particle of an element or compound capable of a stable, independent existence.