The roman numeral is equal to the oxidation number of

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Numeral must be used. The Roman Numeral is equal to the oxidation number of Cu. Since there are two Cl attached to the Cu
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and each Cl is a -1, that equals to a -2. Oxidation numbers of neutral compounds must add up to zero. So copper would have to be a +2 since +2 and -2 add to zero. Copper (II) Chlor ide (II represents the oxidation number of Cu) Name N 2 O 3 Since N 2 O 3 contains two elements, it will be named by the rule for two elements and end in -ide. Nitrogen Ox ide Now check to see if the first element is a transition element- N is not. Check to see if the compound is composed of two non-metals- it is. When made of two non-metals ( a covalent compound) prefixes must be used to tell the number of each element. Di nitrogen Tri ox ide Name: FeSO 4 Since the compound contains three elements, it is named by the rule for three elements. Iron Sulfate( See SO 4 in your polyatomic ion list) Check to see if iron is a transition metal- it is. Then a Roman Numeral is needed. Since SO 4 is 2- the iron must be a 2+ to make it add to zero. Iron (II) Sulfate. Name: K 3 PO 4 Since the compound contains three elements, it is named by the rule for three elements.
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