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The spontaneous disintegration of atomic nuclei.

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Molar Solubility

Number of moles of a solute that dissolve to produce a litre of saturated solution.

Solvent

The dispersing medium of a solution.

Molecular Orbital

An orbit resulting from overlap and mixing of atomic orbitals on different atoms. An MO belongs to the molecule as a whole.

Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.

Overlap

The interaction of orbitals on different atoms in the same region of space.

Spectral Line

Any of a number of lines corresponding to definite wavelengths of an atomic emission or absorption spectrum, represents the energy difference between two energy levels.

 

Coefficient of expansion

The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.

Crystalline Solid

A solid characterized by a regular, ordered arrangement of particles.

Free Radical

A highly reactive chemical species carrying no charge and having a single unpaired electron in an orbital.

Condensed Phases

The liquid and solid phases, phases in which particles interact strongly.