Naming Ionic Naming Ionic CompoundsCompounds

Ionic compounds have two Ionic compounds have two components: components:

A cation (positive ion) and an A cation (positive ion) and an anion (the negative ion).anion (the negative ion).

Ionic Compounds = Cation AnionIonic Compounds = Cation Anion NaCl = Sodium ChlorideNaCl = Sodium Chloride

The cation is named first and The cation is named first and always retains its elemental always retains its elemental name.name.

Transition metalsTransition metals (found in the (found in the middle of the periodic table) middle of the periodic table) always act as cations. Their always act as cations. Their chargecharge must bemust be identified by identified by roman numeralroman numeral because they because they can form more than one type of can form more than one type of ion charge.ion charge.

*You can figure out the charge *You can figure out the charge based on the cation ion charge!based on the cation ion charge!

Ex. Copper (Ex. Copper (IIII) Chloride = CuCl) Chloride = CuCl22

For binary ionic compounds For binary ionic compounds (where the cation and anion are (where the cation and anion are made of only one atom each), made of only one atom each), the anion changes the ending the anion changes the ending to to (–ide).(–ide).

Ox(ygen) + -ide = Ox(ygen) + -ide = OxideOxide

Ex. CaO = Calcium OxideEx. CaO = Calcium Oxide

Use the given name for Use the given name for polyatomic ions.polyatomic ions.

Ex. NaNOEx. NaNO33 = Sodium Nitrate = Sodium Nitrate

You must recognize the You must recognize the polyatomics by memorizing polyatomics by memorizing them! If there are 3 or more them! If there are 3 or more elements in the compound – look elements in the compound – look for a polyatomic!!!for a polyatomic!!!

ExamplesExamples::

BaClBaCl22

MgMg33(PO(PO44))22

KK22S S

PbClPbCl44 FeO FeO CuCu22O O

PbCrOPbCrO44

Pb(COPb(CO33))22

Barium ChlorideBarium Chloride Magnesium Magnesium

PhosphatePhosphate Potassium SulfidePotassium Sulfide Lead (IV) ChlorideLead (IV) Chloride Iron (II) OxideIron (II) Oxide Copper (I) OxideCopper (I) Oxide Lead (II) ChromateLead (II) Chromate Lead (IV) CarbonateLead (IV) Carbonate