3 Naming Compounds That Contain a Metal and a Nonmetal Metals lose electrons to form cations, nonmetals gain electrons to form anionsA binary ionic compounds contains a cation, written first, then an anionTwo types of binary compounds:Type I: the metal present forms only one type of cationType II: the metal present forms two or more cations with different charges
4 What is written first in a binary ionic compound, the cation or the anion?
6 Type 1 Binary Ionic compound • The cation is named first.• Simple cations get their names for elements.• Simple anion’s name has the element’s name with –ide at the end.• You can write the name of the compound by combining the name of the ions.
7 TYPE I COMPOUND Compounds Ions Name Na,Cl Na+,Cl- Sodium Chloride KI Potassium iodideCaSCa^2+,S^2-Calcium SulfideCsBrCs+,Br-Cesium Brodide
9 Type II binary Ionic Compounds Metal present can form two (or more) cation with different chargesMost metals can form more than one type of cation ex:) Cr -> Cr2+ or Cr3+Uses Roman numerals to specify the charge on the cation-Transition metals are almost always Type II
10 Common Type II Cations Ion (Numbers are exponents) Systematic Name Older NameFe^3+iron(III)ferricFe^2+iron (II)ferrousCu^2+copper(II)cupricCu+copper(I)cuprousCo^3+cobalt(III)cobalticCo^2+cobalt(II)cobaltousSn^4+tin(IV)stannicSn^2+tin(II)stannousPb^4+lead(IV)plumbicPb^2+lead(II)plumbousHg^2+mercury(II)mercuricHg2^2+*mercury(I)mercurous
11 Which charge does Iron(II) Chloride refer to? 2+ for Iron.
12 What is the Roman numeral for? -The Roman numerals are used to specify the charge on the cation.
13 Naming Binary Compounds That Contain Only Nonmetals (Type III) First element in the formula is named first, using the full element nameThe second element is named like an anionPrefixes are used to denote the # of atoms presentThe prefix mono- is never used for naming the first elementDrop the final o or a of the prefix when second element is oxygenEx: O1 monooxide monoxide
17 Quiz1. What is the suffix of the ion with the lower charge in the older system of naming?2. Knowing that N2O5 does not have a common name, how would you name it using the Type III system?3. What do we call a compound that contains a cation and an anion?4. What type of metal is specific to Type II system?5. What is the difference between Type I and Type II compounds?
18 Answers The suffix is –ous. Dinitrogen pentoxide Binary ionic compound Transition MetalsThe metals in Type I has one charge while the metals in Type II can have two more charges.