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A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.

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Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.

Dipole

Refers to the separation of charge between two covalently bonded atoms.

Functional Group

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

Ion Product for Water

Equilibrium constant for the ionization of water, Kw = [H3O+][OH-] =1.00 x 10-14 at 25 °C.

Lead Storage Battery

Secondary voltaic cell used in most automobiles.

Forbidden Zone

A relatively large energy separation between an insulator's highest filled electron energy band and the next higher energy vacant band. Beginning in the fourth energy level, a set of seven degenerate orbitals per energy level, higher in energy than s, p, and d orbitals of the same energy level.

Photon

A packet of light or electromagnetic radiation, also called quantum of light.

 

xylene

Any of three oily, colorless, water-insoluble, flammable, toxic, isomeric liquids, C8H10, of the benzene series, obtained mostly from coal tar: used chiefly in the manufacture of dyes.

Melting Point

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

Ionization Constant

Equilibrium constant for the ionization of a weak electrolyte.