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A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.

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Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

Autoionization

An ionization reaction between identical molecules.

Hydrocarbons

Compounds that contain only carbon and hydrogen.

Hydrate Isomers

Isomers of crystalline complexes that differ in whether water is present inside or outside the coordination sphere.

Conduction Band

A partially filled band or a band of vacant energy levels just higher in energy than a filled band, a band within which, or into which, electrons must be promoted to allow electrical conduction to occur in a solid.

Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.

London Forces

Very weak and very short-range attractive forces between short-lived temporary (induced) dipoles, also called dispersion Forces.

Lewis Base

Any species that can make available a share in an electron pair.

Native State

Refers to the occurrence of an element in an uncombined or free state in nature.