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The breaking up of a compound into separate ions.

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Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Ionization Energy

The minimum amount of energy required to remove the most loosely held electron of an isolated gaseous atom or ion.

Crystal Lattice Energy

Amount of energy that holds a crystal together, the energy change when a mole of solid is formed from its constituent molecules or ions (for ionic compounds) in their gaseous state.

Common Ion Effect

Suppression of ionization of a weak electrolyte by the presence in the same solution of a strong electrolyte containing one of the same ions as the weak electrolyte.

Resonance

The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.

Ionization Constant

Equilibrium constant for the ionization of a weak electrolyte.

Mass Number

The sum of the numbers of protons and neutrons in an atom, an integer.

Weak Electrolyte

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

Ionic Geometry

The arrangement of atoms (not lone pairs of electrons) about the central atom of a polyatomic ion.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.