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Describes the order in which electrons fill orbitals in atoms.

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Polymer

A large molecule consisting of chains or rings of linked monomer units, usually characterized by high melting and boiling points.

Critical Temperature

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

Half-Reaction

Either the oxidation part or the reduction part of a redox reaction.

Polyprotic Acid

An Acid that can form two or more hydronium ions per molecule, often a least one step of ionization is weak.

Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

Single Bond

Covalent bond resulting from the sharing of two electrons (one pair) between two atoms.

Actinides

Elements 89 to 103 (between lawrencium and actinium) on the periodic table. Only the first four have been found in nature in appreciable amounts. The remainder have been produced synthetically.

Enthalpy

The heat content of a specific amount of substance, defined as E= PV.

Oxidizing Agent

The substance that oxidizes another substance and is reduced.

Substance

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