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Characteristic of the post-transition minerals, tendency of the outermost s electrons to remain nonionized or un shared in compounds.

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Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

Formula Unit

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

Critical Temperature

The temperature above which a gas cannot be liquefied, the temperature above which a substance cannot exhibit distinct gas and liquid phases.

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Fractional Precipitation

Removal of some ions from solution by precipitation while leaving other ions with similar properties in solution.

Specific Gravity

The ratio of the density of a substance to the density of water.

Reducing Agent

The substance that reduces another substance and is oxidized.

Polyene

A compound that contains more than one double bond per molecule.

Lanthanides

Elements 58 to 71 (after lanthanum).