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Crystal field designation for an inner orbital complex, contains electrons paired t2g orbitals before eg orbitals are occupied in octahedral complexes.

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


Classification of liquid substances that will burn on the basis of flash points. A combustible liquid means any liquid having a flash point at or above 37.8°C (100°F) but below 93.3°C (200°F), except any mixture having components with flash points of 93.3°C (200°F) or higher, the total of which makes up 99 percent or more of the total volume of the mixture.


Mixing of metal with other substances (usually other metals) to modify its properties.

Electronic Geometry

The geometric arrangement of orbitals containing the shared and unshared electron pairs surrounding the central atom of a molecule or polyatomic ion.


The pentosan occurring in woody tissue that hydrolyzes to xylose: used as a source of furfural.

D -Transition elements (metals)

B Group elements except IIB in the periodic table, sometimes called simply transition elements EX. Fe, Ni, Cu, Ti .
For further information see Metals.

Law of Conservation of Energy

Energy cannot be created or destroyed, it may be changed from one form to another.

Emission Spectrum

Spectrum associated with emission of electromagnetic radiation by atoms (or other species) resulting from electronic transitions from higher to lower energy states.



An insoluble solid formed by mixing in solution the constituent ions of a slightly soluble solution.

Liquid Aerosol

Colloidal suspension of liquid in gas.