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Covalent bond in which electron density is symmetrically distributed.

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Binding Energy (nuclear binding energy)

The energy equivalent (E = mc^2) of the mass deficiency of an atom.  where: E = is the energy in joules, m is the mass in kilograms, and c is the speed of light in m/s^2

Ether

Compound in which an oxygen atom is bonded to two alkyl or two aryl groups, or one alkyl and one aryl group.

Critical Pressure

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

Electrophoresis

A technique for separation of ions by rate and direction of migration in an electric field.

Delocalization

Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.

Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

Isomorphous

Refers to crystals having the same atomic arrangement.

Cathode Ray Tube

Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.

Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.

xylidine

Any of six isomeric compounds that have the formula C8H11N, are derivatives of xylene, and resemble aniline: used in dye manufacture.