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In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

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Emission Spectrum

Spectrum associated with emission of electromagnetic radiation by atoms (or other species) resulting from electronic transitions from higher to lower energy states.

 

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Percentage Ionization

The percentage of the weak electrolyte that ionizes in a solution of given concentration.

Dispersed Phase

The solute-like species in a colloid.

Endothermic

Describes processes that absorb heat energy.

Electromagnetic Radiation

Energy that is propagated by means of electric and magnetic fields that oscillate in directions perpendicular to the direction of travel of the energy.

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Rate-determining Step

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

Radical

An atom or group of atoms that contains one or more unpaired electrons (usually very reactive species)