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A salt or ester of salicylic acid.

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Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

xenon tetrafluoride

A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

Nuclear Reactor

A system in which controlled nuclear fisson reactions generate heat energy on a large scale, which is subsequently converted into electrical energy.

Heteronuclear

Consisting of different elements.

Reaction Quotient

The mass action expression under any set of conditions (not necessarily equlibrium), its magnitude relative to K determines the direction in which the reaction must occur to establish equilibrium.

Band of Stability

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

Oxidation

An algebraic increase in the oxidation number, may correspond to a loss of electrons.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Low Spin Complex

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

Addition Reaction

A reaction in which two atoms or groups of atoms are added to a molecule, one on each side of a double or triple bond. Types of addition reaction include electrophilic, nucleophilic (polar) and free radical addition (non-polar).