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

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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.

 

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.

 

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Ionization Constant

Equilibrium constant for the ionization of a weak electrolyte.

Peroxide

A compound containing oxygen in the -1 oxidation state. Metal peroxides contain the peroxide ion, O22

Ionization

In aqueous solution, the process in which a molecular compound reacts with water and forms ions.

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Distilland

The material in a distillation apparatus that is to be distilled.

Band of Stability

Band containing nonradioactive nuclides in a plot of number of neutrons versus atomic number.

Monoprotic Acid

Acid that can form only one hydronium ion per molecule, may be strong or weak. Acid that contains one ionizable hydrogen atom per formula unit.