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Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

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Corrosion

Oxidation of metals in the presence of air and moisture.

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

Amine

Derivatives of ammonia in which one or more hydrogen atoms have been replaced by organic groups.

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.

Polarization

The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.

Dispersing Medium

The solvent-like phase in a colloid.

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Levorotatory

Refers to an optically active substance that rotates the plane of plane polarized light counterclockwise, also called levo.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.