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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.

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Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Standard Electrodes

Half-cells in which the oxidized and reduced forms of a species are present at unit activity, 1.0M solutions of dissolved ions, 1.0atm partial pressure of gases, and pure solids and liquids.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

xenon tetrafluoride

A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

Salicylate

A salt or ester of salicylic acid.

Coordination Isomers

Isomers involving exchanges of ligands between complex cation and complex anion of the same compound.

Semiconductor

A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

Moderator

A substance such as hydrogen, deuterium, oxygen or paraffin capable of slowing fast nuetrons upon collision.

End Point

The point at which an indicator changes colour and a titration is stopped.

Acyl Group

Compound derived from a carbonic acid by replacing the --OH group with a halogen (X), usually --Cl, general formula is O R--C--X.