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Any of three oily, colorless, water-insoluble, flammable, toxic, isomeric liquids, C8H10, of the benzene series, obtained mostly from coal tar: used chiefly in the manufacture of dyes.

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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.

Periodic Table of Elements

An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

Accuracy

How closely a measured value agrees with the correct value.

Fast Neutron

A neutron ejected at high kinetic energy in a nuclear reaction.

Forbidden Zone

A relatively large energy separation between an insulator's highest filled electron energy band and the next higher energy vacant band. Beginning in the fourth energy level, a set of seven degenerate orbitals per energy level, higher in energy than s, p, and d orbitals of the same energy level.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Enzyme

A protein that acts as a catalyst in biological systems.

Polymer

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

Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.