Manganese chloride Sulfur dichloride *\"di-\" is used when there are two nonmetals paired Calcium Bromide The Roman numeral (II) is used when there is a transition metal present that can have different numbers of valence electrons then would normally be expected from reading the periodic table. An example is Copper(II) sulfate because it can have either 2 or three valence electrons Solution Manganese chloride Sulfur dichloride *\"di-\" is used when there are two nonmetals paired Calcium Bromide The Roman numeral (II) is used when there is a transition metal present that can have different numbers of valence electrons then would normally be expected from reading the periodic table. An example is Copper(II) sulfate because it can have either 2 or three valence electrons.