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The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

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Electronic Transition

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

Reversible Reaction

Reactions that do not go to completion and occur in both the forward and reverse direction.

Mass Spectrometer

An instrument that measures the charge-to-mass ratio of charged particles.

Radioactivity

The spontaneous disintegration of atomic nuclei.

Associated Ions

Short-lived species formed by the collision of dissolved ions of opposite charges.

Molarity

Number of moles of solute per litre of solution.

Emulsion

Colloidal suspension of a liquid in a liquid.

Equilibrium Constant

A quantity that characterizes the position of equilibrium for a reversible reaction, its magnitude is equal to the mass action expression at equilibrium. K varies with temperature.

Binding Energy (nuclear binding energy)

The energy equivalent (E = mc^2) of the mass deficiency of an atom.  where: E = is the energy in joules, m is the mass in kilograms, and c is the speed of light in m/s^2

Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.