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A dry cell in which the electrolyte contains KOH.

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S Orbital

A spherically symmetrical atomic orbital, one per energy level.

Half-Reaction

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

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.

Magnetic Quantum Number (mc)

Quantum mechanical solution to a wave equation that designates the particular orbital within a given set (s, p, d, f ) in which a electron resides.

Disproportionation Reactions

Redox reactions in which the oxidizing agent and the reducing agent are the same species.

Octane Number

A number that indicates how smoothly a gasoline burns.

Antibonding Orbital

A molecular orbital higher in energy than any of the atomic orbitals from which it is derived, lends instability to a molecule or ion when populated with electrons, denoted with a star (*) superscript or symbol.

Downs Cell

Electrolytic cell for the commercial electrolysis of molten sodium chloride. For further information see Electrochemistry or Fuel Cells.

Film badge

A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.

Electronic Geometry

The geometric arrangement of orbitals containing the shared and unshared electron pairs surrounding the central atom of a molecule or polyatomic ion.