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The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.

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Octet Rule

Many representative elements attain at least a share of eight electrons in their valence shells when they form molecular or ionic compounds, there are some limitations.

Ketone

Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.

Molecule

The smallest particle of an element or compound capable of a stable, independent existence.

Coulomb

Unit of electrical charge.

Band of Stability

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

Square Planar

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.

xenon

A heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes. Symbol: Xe, at. wt.: 131.30, at. no.: 54.

Percent Purity

The percent of a specified compound or element in an impure sample.

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Sublimation

The direct vaporization of a sold by heating without passing through the liquid state.