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A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

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Half-Life

The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

Turning iron nail into copper nail

This simple chemical experiment shows the so-called process of copper plating of metal products. Copper has the ability to deposit on a metal surface.

Hydrophilic Colloids

Colloidal particles that repel water molecules.

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

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Band of Stability

Band containing nonradioactive nuclides in a plot of number of neutrons versus atomic number.

Radioactivity

The spontaneous disintegration of atomic nuclei.

Bond Order

Half the numbers of electrons in bonding orbitals minus half the number of electrons in antibonding orbitals. Bond order gives an indication to the stability of a bond. Also defined as the difference between the number of bonding electrons and antibonding electrons divided by two.

Artificial Transmutation

An artificially induced nuclear reaction caused by the bombardment of a nucleus with subatomic particiles or small nucei.

Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.