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A term used to describe molecules and polyatomic ions that have one atom in the center and four atoms at the corners of a square.

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Lanthanide Contraction

A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Distilland

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

Phosphorus Oxychloride

Colorless to slightly yellow fuming liquid.

Mol. Wt.: 153.39
M.P.: 20C
B.P.: 105.1C
Density: 1.685 @ 15.5C
Vapor Pressure: 40 mm @ 27.3C
Vapor Density: 5.3
Used as the phosphorus source for phosphorus diffusion.

Coordinate Covalent Bond

A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Coulometry

The quantitative application of Faraday's Law to the analysis of materials. The current and time are the usual variables measured.

Standard Molar Volume

The volume occupied by one mole of an ideal gas under standard conditions, 22.4liters.

Polarimeter

A device used to measure optical activity.

Aromatic Hydrocarbons

Benzene and its derivatives.