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Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.

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Nuclear Fission

The process in which a heavy nucleus splits into nuclei of intermediate masses and one or more protons are emitted.

Chemical Kinetics

The study of rates and mechanisms of chemical reactions and of the factors on which they depend.

Breeder Reactor

A nuclear reactor that produces more fissionable nuclear fuel than it consumes.

Allotropes

Different forms of the same element in the same physical state.

Dispersing Medium

The solvent-like phase in a colloid.

Downs Cell

Electrolytic cell for the commercial electrolysis of molten sodium chloride. For further information see Electrochemistry or Fuel Cells.

Critical Temperature

The temperature above which a gas cannot be liquefied, the temperature above which a substance cannot exhibit distinct gas and liquid phases.

Amino Acid

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

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.

D-Orbitals

Beginning in the third energy level, aset of five degenerate orbitals per energy level, higher in energy than s and p orbitals of the same energy level.

 

Biodegradability

The ability of a substance to be broken down into simpler substances by bacteria.

 

Valence Bond Theory

Assumes that covalent bonds are formed when atomic orbitals on different atoms overlap and the electrons are shared.

Alpha Particles

A helium nucleus.

Radioactive Dating

Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.

Boyle's Law

At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.

Neutron

A neutral subatomic particle having a mass of 1.0087 amu.

Ostwald Process

A process for the industrial production of nitrogen oxide and nitric acid from ammonia and oxygen.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Electron Deficient Compounds

Compounds that contain at least one atom (other than H) that shares fewer than eight electrons.

Surface Tension

It is the force in dynes acting along the surface of the liquid 1cm in length and perpendicular to it.