There are two types of attractive forces in covalent compounds:
The force that holds the atoms together in a molecule (the covalent bond).
The force that <u>operates between molecules</u>, called an intermolecular force.
Because intermolecular forces are usually quite weak compared with the forces holding atoms together within a molecule, <u>molecules of a covalent compound are not held together tightly</u>. Consequently, covalent compounds are usually gases, liquids, or low-melting solids.
Most covalent compounds aqueous solutions generally do not conduct electricity, because the compounds are nonelectrolytes.
I think the correct answer from the choices listed above is option A. The three components of air are all <span>classified as pure substances since they are not chemically bonded so they can be separated by certain processes and be present as a pure substance. Hope this answers the question.</span>
