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A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

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Hydrate

A solid compound that contains a definite percentage of bound water.

Carbanion

An organic ion carrying a negative charge on a carbon atom.

Isotopes

Two or more forms of atoms of the same element with different masses, atoms containing the same number of protons but different numbers of neutrons.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.

Reaction Stoichiometry

Description of the quantitative relationships among substances as they participate in chemical reactions.

Capillary

A tube having a very small inside diameter.

Intermolecular Forces

Forces between individual particles (atoms, molecules, ions) of a substance.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Actinides

Elements 89 to 103 (between lawrencium and actinium) on the periodic table. Only the first four have been found in nature in appreciable amounts. The remainder have been produced synthetically.