Writing Formulas and naming compounds

Binary ionic compounds with metals having variable oxidation number

Write the formulas for the following compounds:

chromium (II) chloride

iron (II) oxide

nickel (II) nitride

tin (IV) bromide

lead (II) sulfide

copper (I) phosphide

chromium (III) fluoride

iron (III) oxide

tin (II) iodide

lead (IV) nitride

Name the following compounds: