Simple molecules

• Simple molecular substances have low melting and boiling points because the forces of attraction between these molecules are very weak
• The atoms within the molecules are held together by very strong covalent bonds
• It's these feeble intermolecular forces that you need to overcome to melt or boil a simple covalent compound
• Most simple molecular substances are liquids or gases at room temperature
• Simple molecular substances don't conduct electricity because they don't have free electrons or ions