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In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

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Molecular Equation

Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.

Rate-law Expression

Equation relating the rate of a reaction to the concentrations of the reactants and the specific rate of the constant.

Metallic Bonding

Bonding within metals due to the electrical attraction of positively charges metal ions for mobile electrons that belong to the crystal as a whole.

Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.

 

Reversible Reaction

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

Dimer

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

Amino Acid

Compound containing both an amino and a carboxylic acid group.The --NH2 group.

Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Partial Pressure

The pressure exerted by one gas in a mixture of gases.

Effective Collisons

Collision between molecules resulting in a reaction, one in which the molecules collide with proper relative orientations and sufficient energy to react.