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Colloidal suspension of a gas in a liquid.

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Electronic Transition

The transfer of an electron from one energy level to another.

End Point

The point at which an indicator changes colour and a titration is stopped.

Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Ionization

In aqueous solution, the process in which a molecular compound reacts with water and forms ions.

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Isotopes

Two or more forms of atoms of the same element with different masses, atoms containing the same number of protons but different numbers of neutrons.

Breeder Reactor

A nuclear reactor that produces more fissionable nuclear fuel than it consumes.

Ground State

The lowest energy state or most stable state of an atom, molecule or ion.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.