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Amount of energy that must be absorbed by reactants in their ground states to reach the transition state so that a reaction can occur. In other words, activation energy is the minimum energy required for a chemical reaction to occur.

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Quantum Mechanics

Mathematical method of treating particles on the basis of quantum theory, which assumes that energy (of small particles) is not infinitely divisible.

Liquid Aerosol

Colloidal suspension of liquid in gas.

Native State

Refers to the occurrence of an element in an uncombined or free state in nature.

 

Electromagnetic Radiation

Energy that is propagated by means of electric and magnetic fields that oscillate in directions perpendicular to the direction of travel of the energy.

Halogens

Group VIIA elements: F, Cl, Br, I

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Actinides

Elements 89 to 103 (between lawrencium and actinium) on the periodic table. Only the first four have been found in nature in appreciable amounts. The remainder have been produced synthetically.

Acyl Group

Compound derived from a carbonic acid by replacing the --OH group with a halogen (X), usually --Cl, general formula is O R--C--X.

Linkage Isomers

Isomers in which a particular ligand bonds to a metal ion through different donor atoms.

 

Electrolytic Conduction

Conduction of electrical current by ions through a solution or pure liquid.