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Energy required to pair two electrons in the same orbital.

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Foam

Colloidal suspension of a gas in a liquid.

Curie (Ci)

The basic unit used to describe the intensity of radioactivity in a sample of material. One curie equals 37 billion disintegrations per second or approximately the amount of radioactivty given off by 1 gram of radium.

Amine Complexes

Complex species that contain ammonia molecules bonded to metal ions.

Metal

An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

Isomers

Different substances that have the same formula.

Fatty Acids

An aliphatic acid, many can obtained from animal fats.

Molecular Formula

Formula that indicates the actual number of atoms present in a molecule of a molecular substance.

Liquid Aerosol

Colloidal suspension of liquid in gas.

Ionic Geometry

The arrangement of atoms (not lone pairs of electrons) about the central atom of a polyatomic ion.

Zone Refining

A method of purifying a bar of metal by passing it through an induction heater, this causes impurties to move along a melted portion. This method applies the fact when a metal crystallizes on cooling, impurities are automatically expelled as they do not form part of the crystal.