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A vertical column in the periodic table, also called a family.

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    Diamond is a crystalline modification of pure carbon formed in the deep interior of the Earth, in the upper mantle at depths of more than 80-100 kilometers, at exceptionally high pressure and temperature. It is the most precious stone, the hardest and most wear-resistant mineral, the most...

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Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Electron Deficient Compounds

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

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Dimer

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

Nitrogen Cycle

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

Precipitate

An insoluble solid formed by mixing in solution the constituent ions of a slightly soluble solution.

Evaporation Rate

The rate at which a particular substance will vapourize (evaporate) when compared to the rate of a known substance such as ethyl ether. This term is especially useful for health and fire-hazard considerations.

Boiling Point

The temperature at which the vapor pressure of a liquid is equal to the applied pressure, also the condensation point

Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.