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The arrangement of atoms (not lone pairs of electrons) about the central atom of a polyatomic ion.

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Radioactivity

The spontaneous disintegration of atomic nuclei.

xylan

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

Secondary Standard

A solution that has been titrated against a primary standard. A standard solution is a secondary standard.

 

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Supersaturated Solution

A solution that contains a higher than saturation concentration of solute, slight disturbance or seeding causes crystallization of excess solute.

Molecular Formula

Formula that indicates the actual number of atoms present in a molecule of a molecular substance.

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.

 

Oxidation Numbers

Arbitrary numbers that can be used as mechanical aids in writing formulas and balancing equations, for single- atom ions they correspond to the charge on the ion, more electronegative atoms are assigned negative oxidation numbers (also called Oxidation states).

Dipole

Refers to the separation of charge between two covalently bonded atoms.

Electron Deficient Compounds

Compounds that contain at least one atom (other than H) that shares fewer than eight electrons.