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Naming Binary Ionic Compounds

Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

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Page 1: Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

Naming Binary Ionic Compounds

Page 2: Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

What is a binary ionic compound?

• IONIC COMPOUND– Formed from ionic bonds– Metal and nonmetal

• Left of stepline on PT=metal

• Right of stepline on PT=nonmetal

• BINARY– Prefix “bi” means 2– A binary compound

contains teo different kinds of elements

Page 3: Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

A Common Example

• NaCl– Na=sodium=metal=cation– Cl=chlorine=nonmetal=anion– Two elements joined by an ionic bond

• Na loses electron to form positive ion• Cl gains electron to form negative ion• Ions are attracted by electrostatic charges

Page 4: Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

How do we name it?Name the metal

Na

Sodium

Name the non-metal with an “-ide” ending

Cl

ChlorineChlorineChloride

Page 5: Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

NaCl

sodium chloride

Page 6: Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

Is it always this easy?

• Almost…but not quite!• Group 1,2, and 13 metals have charges

determined by their position on the periodic table…1+, 2+. 3+

• Ag is always 1+• Cd is always 2+• Zn is always 2+

Page 7: Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

Transition metals

• The charges of transition metal cations (and a few others under the stepline) vary

• The charge of these cations must be calculated to balance the negative charge of the anions involved

Page 8: Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

CuS is copper (II) sulfide• Copper can have different charges• What is it paired up with and what ratio is needed to have a net

charge of zero?• The anion is sulfide

– Sulfur produces a sulfide ion which is 2-. (You know this from the periodic table.)

• The cation is copper– One Cu is present, so its charge must be 2+ to balance the 2- charge from

the S

• Name cation, show charge as Roman numeral in parentheses, name anion with -ide ending.

Page 9: Naming Binary Ionic Compounds. What is a binary ionic compound? IONIC COMPOUND – Formed from ionic bonds – Metal and nonmetal Left of stepline on PT=metal

Fe2S3 is iron (III) sulfide

• Sulfide is 2- (from its position on periodic table)• There are 3 sulfide 3 x 2- = 6-

• Iron can have different charges• 2 iron ions balance a 6- charge• 2 x ? = 6+• Iron’s charge in this compound is 3+• Name cation, show charge as Roman numeral in parentheses,

name anion with -ide ending.

• Reverse criss-cross!