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Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

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Anion

A negative ion, an atom or goup of atoms that has gained one or more electrons.

 

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Radiation

High energy particles or rays emitted during the nuclear decay processes.

xanthene dye

Any of a group of dyes having a molecular structure related to that of xanthene in which the aromatic (C6H4) groups are the chromophore.

 

Canal Ray

Stream of positively charged particles (cations) that moves toward the negative electrode in cathode ray tubes, observed to pass through canals in the negative electrode.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.

 

Particulate Matter

Fine divided solid particles suspended in polluted air.

Positron

A Nuclear particle with the mass of an electron but opposite charge.

Autoionization

An ionization reaction between identical molecules.

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances