4.1 Naming Binary Compounds Period 5 Group 5

Naming Compounds that Contain Metals & Nonmetals Metals lose one or more electrons to become a cation Nonmetals gain one or more electrons to become an anion Resulting substance is called a binary ionic compound (BIC) BIC’s contain cations and anions. Cations come first Type I- Na+, Cs+, Ca2+, Al3+ Type II- Forms two or more cations

How many types of binary ionic compounds are there? There are 3 types of binary ionic compounds; Type I, Type II, and Type III.

Type I Cations are always named first, anions second Anions take the root and adds –ide Formulas- ions are represented by the element symbol Cl. Cl means Cl-, Na means Na+ Individual ions- charge is always included

Type I Example: Compound Ions Present Name NaS Compound Ions Present Sodium fluoride

Type II Many metals form more than one type of cation We use roman numerals to specify the cation charge To determine the charge, we balance them out Roman numerals tell the charge on the ion, not the number of ions present

Type II Example: Compound Ions Present Name FeO Compound Ions Present iron (II) oxide

Type III Type III only contains nonmetals The first element in the formula is named first, and the full element name is used The second name is named as if it were an anion (-ide) Prefixes are used to figure out the number of atoms present Prefix mono- is never used for the first element

Type III Example: Compound Ions Present Name B4N2 Compound Pb2+, S2- pentaboron dinitride

Review Type I- ionic compound with metals that always form a cation with the same charge Type II- ionic compounds with metals (transition metals) that form cations with various charges Type III- compounds with only nonmetals

Review Example: Type II PbCl2 PbCl2 Pb2+, Cl- Compound Ions Present Name PbCl2 Compound Ions Present Name PbCl2 Pb2+, Cl- lead (II) chloride

Quiz What happens to the metals and nonmetals? 2. Type I 3. Type II Compound Ions Present Name HF Compound Ions Present Name PbS

Quiz Type III 5. Type I Compound Ions Present Name N2O3 Compound MgBr

Answer Key The metals lose ions to become a cation and the nonmetals gain ions to become an anion. 2. 3. Compound Ions Present Name HF H+, F- hydrogen fluoride Compound Ions Present Name PbS Pb2+, S2- lead (II) sulfide

Answer Key 4. 5. Compound Ions Present Name N2O3 N3-, O2- dinitrogen oxide Compound Ions Present Name MgBr Mg2+, Br - magnesium bromide

References http://wps.prenhall.com/wps/media/objects/165/169289/SW-comart/2_6_table.gif