Naming and Writing Polyatomic Ionic Compounds

12/4/13

Reference Material Poly means many

Polyatomic ions are a group of atoms that have a charge when they are together

Most have a negative charge

Writing Polyatomic Ionic Compounds Formulas

1. We look at the name of the compound2. Find the oxidation number for each ion3. Write the symbol and its charge4. DROP & SWAP

Sodium carbonate

Writing Polyatomic Ionic Compounds Formulas

1. We look at the name of the compound2. Find the oxidation number for each ion3. Write the symbol and its charge4. DROP & SWAP

Magnesium nitrate

Writing Polyatomic Ionic Compounds Formulas

1. We look at the name of the compound2. Find the oxidation number for each ion3. Write the symbol and its charge4. DROP & SWAP

Barium sulfate

Write the formula for the following polyatomic ionic compounds:

Ammonium Sulfide

Potassium Carbonate

Aluminum Phosphate

Naming Polyatomic Ionic Compounds Rules1. Write your cation first2. Write your anion second

if polyatomic ion, keep ending if nonmetal replace ending with –ide

Examples:

KCN _______________________________

Naming Polyatomic Ionic Compounds Rules1. Write your cation first2. Write your anion second

if polyatomic ion, keep ending if nonmetal replace ending with –ide

Examples:

Ca(OH)2 ____________________________

Naming Polyatomic Ionic Compounds Rules1. Write your cation first2. Write your anion second

if polyatomic ion, keep ending if nonmetal replace ending with –ide

Examples:

NH4F _______________________________

Naming Polyatomic Ionic Compounds

KOH ______________________________________

CaSO4 ____________________________________

BaCO3 _____________________________________

Al2(SO4)3 ________________________________