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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."

 

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Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

Square Planar Complex

Complex in which the metal is in the center of a square plane, with ligand donor atoms at each of the four corners.

Salicylate

A salt or ester of salicylic acid.

Polyene

A compound that contains more than one double bond per molecule.

Colligative Properties

Physical properties of solutions that depend upon the number but not the kind of solute particles present.

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Inner Orbital Complex

Valence bond designation for a complex in which the metal ion utilizes d orbitals for one shell inside the outermost occupied shell in its hybridization.

London Forces

Very weak and very short-range attractive forces between short-lived temporary (induced) dipoles, also called dispersion Forces.

Fast Neutron

A neutron ejected at high kinetic energy in a nuclear reaction.

Solubility Product Constant

Equilibrium constant that applies to the dissolution of a slightly soluble compound.