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The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

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Graham's Law

The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.

Born-Haber Cycle

A series of reactions (and accompanying enthalpy changes) which, when summed, represents the hypothetical one-step reaction by which elements in their standard states are converted into crystals of ionic compounds (and the accompanying enthalpy changes.)

Electronic Geometry

The geometric arrangement of orbitals containing the shared and unshared electron pairs surrounding the central atom of a molecule or polyatomic ion.

Allotropes

Different forms of the same element in the same physical state.

Amphoterism

The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.

Debye

The unit used to express dipole moments.

Associated Ions

Short-lived species formed by the collision of dissolved ions of opposite charges.

Standard Electrode Potential

By convention, potential, Eo, of a half-reaction as a reduction relative to the standard hydrogen electrode when all species are present at unit activity.

 

Nernst Equation

Corrects standard electrode potentials for nonstandard conditions.

Hydration

Reaction of a substance with water.