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A substance at temperature above its critical temperature.

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Crystal Lattice

A pattern of arrangement of particles in a crystal.

Partial Pressure

The pressure exerted by one gas in a mixture of gases.

Amphiprotism

Ability of a substance to exhibit amphiprotism by accepting donated protons.

Square Planar Complex

Complex in which the metal is in the center of a square plane, with ligand donor atoms at each of the four corners.

PseudobinaryIonic Compounds

Compounds that contain more than two elements but are named like binary compounds.

Paramagnetism

Attraction toward a magnetic field, stronger than diamagnetism, but still weak compared to ferromagnetism.

Addition Reaction

A reaction in which two atoms or groups of atoms are added to a molecule, one on each side of a double or triple bond. Types of addition reaction include electrophilic, nucleophilic (polar) and free radical addition (non-polar).

Pairing

A favourable interaction of two electrons with opposite m , values in the same orbital.

Period

The elements in a horizontal row of the periodic table.

Oxidation-reduction Reactions

Reactions in which oxidation and reduction occur, also called redox reactions.