1. 22.3 – Writing formulas for Ionic Compounds with Polyatomics
Part B
Focus on what is in PINK

2. Objectives
Write formulas for ionic compounds

3. Writing Ionic Formulas w/ Polyatomics
Watch the Tyler DeWitt Video and complete the viewing guide, you will add it to your notes on this chapter Youtube video

4. Polyatomic Ions Groups of atoms that stay together and have a charge
A positively or negatively charged, covalently bonded group of atoms
Polyatomic ions as a whole contains two or more elements

5. YOU NEVER CHANGE THE FORMULA OF THE POLYATOMIC
Polyatomic Formulas
When writing out the formula for polyatomics, treat the polyatomic as a whole and place () around the symbol
Then place any subscripts outside of the () because the subscript applies to the entire polyatomic
YOU NEVER CHANGE THE FORMULA OF THE POLYATOMIC

6. Name
Symbol
ammonium
NH4+1
acetate
C2H3O2-1
chlorate
ClO3-1
chlorite
ClO2-1
cyanide
CN-1
hydroxide
OH-1
nitrate
NO3-1
carbonate
CO3-2
sulfate
SO4-2
phosphate
PO4-3

7. Write the formulas for these
Lithium sulfide
Tin (II) oxide
Tin (IV) oxide
Magnesium fluoride
Copper (II) sulfate
Iron (III) phosphide
Gallium nitrate
Iron (III) sulfide
Barium nitrate

8. In-Class Assignment/Homework
PS 22.3 A WKT 2 - Criss Cross practice