Final answer:
According to the IUPAC nomenclature system, covalent compounds use prefixes in their names to indicate the number of each type of atom in a molecule, while ionic compounds do not use prefixes. For example, sulfur hexafluoride (SF6) is a covalent compound that contains six fluorine atoms.
Step-by-step explanation:
According to the IUPAC nomenclature system, the types of compound that use prefixes in their names are covalent compounds. Covalent compounds are formed by the bonding of two nonmetals, and they use prefixes to indicate the number of each type of atom in a molecule. For example, SF6 is called sulfur hexafluoride, where 'hexa-' indicates there are six fluorine atoms. In contrast, ionic compounds do not use prefixes in their names.