Final answer:
Ionic compounds with metals that have variable charges are named using Roman numerals to indicate the metal's charge, while covalent compounds use prefixes to indicate the number of each atom. MnO2 and Mn2O7 have manganese in +4 and +7 oxidation states, respectively. Sulfur hexafluoride contains six fluorine atoms.
Step-by-step explanation:
Naming Ionic Compounds
To name the given ionic compounds where the metal has more than one oxidation state, we use Roman numerals to indicate the charge on the metal ion. This is often referred to as the Stock system of nomenclature.
- FeI2 is iron(II) iodide
- CrCl2 is chromium (II) chloride
- CuS is copper(II) sulfide
Naming Covalent Compounds
Covalent compounds are named using prefixes to indicate the number of atoms of each element in the compound.
- As2O5 is diarsenic pentoxide
- MnF3 is manganese(III) fluoride
- SeO2 is selenium dioxide
- PCl3 is phosphorus trichloride
Oxidation States of Manganese Compounds
MnO2 is manganese(IV) oxide, where manganese has an oxidation state of +4. Mn2O7 is manganese(VII) oxide, where manganese has an oxidation state of +7. The oxidation state reflects the number of electrons an atom gains or loses when forming a compound.
Fluorine Count in Sulfur Hexafluoride
A molecule of sulfur hexafluoride (SF6) contains six fluorine atoms.