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Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

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Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

Viscosity

Resistance offered by the molecules of a liquid to flow is termed as viscosity.

Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.

Emulsifying Agent

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

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Inhibitory Catalyst

An inhibitor, a catalyst that decreases the rate of reaction.

Alkynes

Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.

Molecular Formula

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

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Metallic Conduction

Conduction of electrical current through a metal or along a metallic surface.