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Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

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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.

Crystal Field Theory

Theory of bonding in transition metal complexes in which ligands and metal ions are treated as point charges, a purely ionic model, ligand point charges represent the crystal (electrical) field perturbing the metal?s d orbitals containing nonbonding electrons.

Alpha Particles

A helium nucleus.

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Reversible Reaction

Reactions that do not go to completion and occur in both the forward and reverse direction.

Saturated Hydrocarbons

Hydrocarbons that contain only single bonds. They are also called alkanes or paraffin hydrocarbons.

Hydrocarbons

Compounds that contain only carbon and hydrogen.

Base

A substance that produces OH (aq) ions in aqueous solution. Strong soluable bases are soluble in water and are completely dissociated. Weak bases ionize only slightly.

Solubility Product Constant

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

Antibonding Orbital

A molecular orbital higher in energy than any of the atomic orbitals from which it is derived, lends instability to a molecule or ion when populated with electrons, denoted with a star (*) superscript or symbol.