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An atom or group of atoms that contains one or more unpaired electrons (usually very reactive species)

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Oxidation

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

Rate-law Expression

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

Electronic Geometry

The geometric arrangement of orbitals containing the shared and unshared electron pairs surrounding the central atom of a molecule or polyatomic ion.

Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.

Fast Neutron

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

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Amino Acid

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

Hydrophilic Colloids

Colloidal particles that repel water molecules.

Homogeneous Equilibria

Equilibria involving only one species in a single phase. For example, all gases, all liquids or all solids.