simple molecular structure

Click a letter for the index

Or search the encyclopaedia:

 

 

Go

 

In chemistry, the structure of a non-metallic element or compound, in which groups of atoms are joined together by covalent bonds to form a molecule. The molecules of non-metals are often made up of two identical atoms covalently bonded together, for example: oxygen (O₂), hydrogen (H₂), and nitrogen (N₂). There are also molecular compounds made up of different non-metal atoms bonded together, such as water (H₂O), ammonia (NH₃), and carbon dioxide (CO₂).

Simple molecular structures have distinctive properties. Although the covalent bonds within the molecules are very strong, the molecules are held together by relatively weak intermolecular forces. As the molecules can be parted easily, simple molecular substances are not very hard or strong and have low melting and boiling points. At room temperature, most simple molecular substances are either a gas or liquid. They do not usually dissolve in water and do not conduct electricity because they have no ions. Simple molecular solids, such as ice, melt easily and tend to dissolve in organic solvents.

Green stands for agriculture, the lush vegetation, and the enduring vitality of the population. Gold symbolizes warmth, the bright spirit of the people, and the golden sands. Blue represents the sky and sea. Effective date: 24 October 1985. >>