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Outermost electrons of atoms, usually those involved in bonding.

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Nitrogen Cycle

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

Enantiomer

One of the two mirror-image forms of an optically active molecule.

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.

Alkylbenzene

A compound containing an alkyl group bonded to a benzene ring.

Ketone

Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.

Overlap

The interaction of orbitals on different atoms in the same region of space.

Flux

A substance added to react with the charge, or a product of its reduction, in metallurgy, usually added to lower a melting point.

Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

Condensation

Liquefaction of vapor.

Freezing Point Depression

The decrease in the freezing point of a solvent caused by the presence of a solute.ing Point