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A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

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Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Cation

A positive ion, an atom or group of atoms that has lost one or more electrons.

Reaction Quotient

The mass action expression under any set of conditions (not necessarily equlibrium), its magnitude relative to K determines the direction in which the reaction must occur to establish equilibrium.

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Derivative

A compound that can be imagined to arise from a partent compound by replacement of one atom with another atom or group of atoms. Used extensively in orgainic chemistry to assist in identifying compounds.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Bomb Calorimeter

A device used to measure the heat transfer between system and surroundings at constant volume.

Square Planar

A term used to describe molecules and polyatomic ions that have one atom in the center and four atoms at the corners of a square.

Cohesive Forces

All the forces of attraction among particles of a liquid.

Dimer

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