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Molecule formed by combination of two smaller (identical) molecules.

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Nuclear Binding Energy

Energy equivalent of the mass deficiency, energy released in the formation of an atom from the subatomic particles.

 

Binary Compound

A compound consisting of two elements, may be ionic or covalent.

xenon tetrafluoride

A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

Octane Number

A number that indicates how smoothly a gasoline burns.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Alkaline Earth Metals

Group IIA metals

Lanthanides

Elements 58 to 71 (after lanthanum).

Compressed Gas

A gas or mixture of gases having, in a container an absolute pressure exceeding 40 psi at 21.1°C (70°F)

Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Detergent

A soap-like emulsifer that contains a sulfate, SO3 or a phosphate group instead of a carboxylate group.