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Spontaneous decomposition of an atom.

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Ketone

Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.

Molecule

The smallest particle of an element or compound capable of a stable, independent existence.

Hydrocarbons

Compounds that contain only carbon and hydrogen.

Natural Radioactivity

Spontaneous decomposition of an atom.

Combustible

Classification of liquid substances that will burn on the basis of flash points. A combustible liquid means any liquid having a flash point at or above 37.8°C (100°F) but below 93.3°C (200°F), except any mixture having components with flash points of 93.3°C (200°F) or higher, the total of which makes up 99 percent or more of the total volume of the mixture.

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Actinides

Elements 89 to 103 (between lawrencium and actinium) on the periodic table. Only the first four have been found in nature in appreciable amounts. The remainder have been produced synthetically.

Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Electron Configuration

Specific distribution of electrons in atomic orbitals of atoms or ions.

Alloying

Mixing of metal with other substances (usually other metals) to modify its properties.