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A substance of two or more elements in fixed proportions. Compounds can be decomposed into their constituent elements.

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Homologous Series

A series of compounds in which each member differs from the next by a specific number and kind of atoms.

Heteronuclear

Consisting of different elements.

Oxide

A binary compound of oxygen.

Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Cloud Chamber

A device for observing the paths of speeding particiles as vapor molecules condense on them to form foglike tracks.

Gem-dimethyl group

Two methyl groups of the same carbon atom.

Explosive limits

The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

Features of the Scanning Tunneling Microscope

The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types.

The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The device is based on a complex process of "tunneling" electrons between the material and the tip of a probe.

Outer Orbital Complex

Valence bond designation for a complex in which the metal ion utilizes d orbitals in the outermost (occupied) shell in hybridization.