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A thermodynamic state or property that measures the degree of disorder or randomness of a system.

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Isoelectric

Having the same electronic configurations.

Dispersed Phase

The solute-like species in a colloid.

Energy

The capacity to do work or transfer heat.

Delocalization

Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.

Period

The elements in a horizontal row of the periodic table.

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Artificial Transmutation

An artificially induced nuclear reaction caused by the bombardment of a nucleus with subatomic particiles or small nucei.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Octahedral

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

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.