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

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Hydrogen Bond

A fairly strong dipole-dipole interaction (but still considerably weaker than the covalent or ionic bonds) between molecules containing hydrogen directly bonded to a small, highly electronegative atom, such as N, O, or F.

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.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Nuclides

Refers to different atomic forms of all elements in contrast to ?isotopes?, which refer only to different atomic forms of a single element.

Transition State Theory

Theory of reaction rates that states that reactants pass through high-energy transition states before forming products.

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Eutrophication

The undesirable overgrowth of vegetation caused by high concentrates of plant nutrients in bodies of water.

Boiling Point Elevation

The increase in the boiling point of a solvent caused by the dissolution of a nonvolatile solute.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.