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The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.

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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.

Heisenberg Uncertainty Principle

It is impossible to determine accurately both the momentum and position of an electron simultaneously.

Linear Accelerator

A device used for accelerating charged particles along a straight line path.

Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Endothermic

Describes processes that absorb heat energy.

Particulate Matter

Fine divided solid particles suspended in polluted air.

Method of Initial Rates

Method of determining the rate-law expression by carrying out a reaction with different initial concentrations and analyzing the resultant changes in initial rates.

DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Alkaline Earth Metals

Group IIA metals