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Describes the order in which electrons fill orbitals in atoms.

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Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Ionic Bonding

Chemical bonding resulting from the transfer of one or more electrons from one atom or a group of atoms to another.

Octane Number

A number that indicates how smoothly a gasoline burns.

Evaporation Rate

The rate at which a particular substance will vapourize (evaporate) when compared to the rate of a known substance such as ethyl ether. This term is especially useful for health and fire-hazard considerations.

Molecular Equation

Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.

Dynamic Equilibrium

An equilibrium in which processes occur continuously, with no net change. When two (or more) processes occur at the same rate so that no net change occurs.

Condensed Phases

The liquid and solid phases, phases in which particles interact strongly.

Aromatic Hydrocarbons

Benzene and its derivatives.


The breaking up of a compound into separate ions.

Crystal Field Theory

Theory of bonding in transition metal complexes in which ligands and metal ions are treated as point charges, a purely ionic model, ligand point charges represent the crystal (electrical) field perturbing the metal?s d orbitals containing nonbonding electrons.