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Spectrum that contains all wave-lengths in a specified region of the electromagnetic spectrum.

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Solution

Homogeneous mixture of two or more substances.

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.

Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Ground State

The lowest energy state or most stable state of an atom, molecule or ion.

Polarization

The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.

Coulomb

Unit of electrical charge.

xenon trioxide

A colorless, nonvolatile solid, XeO3, explosive when dry: in solution it is called xenic acid.

Plasma

A physical state of matter which exists at extremely high temperatures in which all molecules are dissociated and most atoms are ionized.

Radioactive Tracer

A small amount of radioisotope replacing a nonradioactive isotope of the element in a compound whose path (for example, in the body) or whose decomposition products are to be monitored by detection of radioctivity, also called a radioactive label.

xylic acid

Any of six colorless, crystalline, isomeric acids having the formula C9H10O2, derived from xylene.