Ionic Compounds with Polyatomic Ions
Note Taking Guide
*Objective: To learn how to write and name compounds with polyatomic ions.
Slideshow notes:
 Polyatomic Ions:
1.
_______________ – many/multiple/more than one
2.
Polyatomic ions – ions that are made up with _________________________________
3.
Examples: ______ _________ MnO
4
-1 C
2
H
3
O
2
-1
4.
These are compounds that act just like an ___________________________________
 Complex Ionic Compounds or Ionic Compounds with polyatomic ions:
1.
Any ionic compound that contains _________ or more elements.
2.
It can ONLY occur if there is a ________________________________ present in the compound.

Practice Identifying Complex Ionic Compounds:
1.
Identify the compounds with polyatomic ions:
2.
Hint: Look for 3 or more different atoms in the compound.
3.
Circle the compounds that have polyatomic ions in them:
NaCl Co(CO
3
)
2
Li
2
SO
4
CsNO
3
MgO Cr
3
(PO
4
)
2
 Rules for naming Complex Ionic Compounds/Ionic Compounds with Polyatomic Ions:
1.
Name the first element directly off the periodic table, IF IT IS A _______________
*Remember to identify the charge of any transition metal using
____________________________________
2.
Name the second element, IF IT IS A ________________________ (from the periodic table), by changing the ending to _______________
3.
If either of the elements is a _______________________________, name it directly off the polyatomic list, replacing step 1 or 2.
4.
Always double check the oxidation number of the anion, polyatomic or single ion, if the cation is a transition metal.
 Example 1: Na
2
CO
3
 ______________________________________________
 Example 2: NH
4
Cl
 ______________________________________________

Complete the following table:
Compound formula:
NH
4
ClO
3
Fe(NO
3
)
2
Mg
3
(PO
4
)
2
(NH
4
)
2
O
Mn(C
2
H
3
O
2
)
3
Al(OH)
3
Cation symbol:
Fe +2
Anion symbol:
NO
3
-1
Compound Name:
Iron (II) nitrate

Rules for writing complex ionic compounds/ionic compounds with polyatomic ions formulas:
1.
Write out the ion symbols for each of the elements/polyatomic present
2.
Write the charge of each ion present
3.
_____________________ (+/-)
4.
______________ the numbers
5.
_________________if necessary
6.
____________________________ – put the polyatomic ion(s) in parenthesis no matter how many you need.
 Example 1: Sodium Phosphate
Na +1 PO
4
-3
Formula:_______________________________
 Example 2: Aluminum Carbonate
Al +3 CO
3
-2
Al
2
(CO
3
)
3
– when you need more than one, polyatomic, put the number from the opposite, usually the cation, outside the parenthesis.
*Only implement the following, when you need more than one polyatomic to balance the charges:
7.
When we need ______________________polyatomic ions to create a
________________compound, ( ) are used, like always, around the polyatomic ion and its subscript.
8.
The new subscript (from the swap and drop) is placed ___________________of the ( )
9.
The polyatomic ion MUST be treated as __________________….it is a unit that
___________________ be separated.
Example: Calcium Chlorate
Ca +2 ClO
3
-1
Formula: ______________________________________

Complete the following table:
Compound Name:
Beryllium nitrate
Chromium (II) hydroxide
Gallium chlorate
Ammonium carbonate
Zirconium (III) sulfate
Cation symbol:
Be +2
Anion symbol:
NO
3
-1
Compound Formula:
Be(NO
3
)
2
*I will provide the answers at a different time during the nearpod lesson.
Youtube Video Notes:
*You will need to have out your polyatomic ions list.
 Groups of atoms that are bonded, and have a charge are known as
_________________________.
 Think of these as a group or cluster of atoms, acting like a single element. They cannot be separated, or it will change what they are.
 Most polyatomic ions are ____________________.
*Your chart is slightly different, because the ones on your list, are the only ones you need for my class.
What is the only positive polyatomic ion? ____________________________
 What is up with the –ate and the –ite? o The _______________________ number of oxygen atoms (meaning the one with more oxygen) ends in - ________________.
○ Ex: _____________________ o
The ______________________ number of oxygen atoms (meaning the one with less oxygen) ends in -______________________.
○ Ex: _______________________
Complete the following table:
Polyatomic Ion Symbol:
NO
3
-1
SO
SO
NH
4
-2
3
-2
4
+1
Polyatomic Ion Name:

*if you have any questions during the video, remember to write them down so I can answer them on
Monday, or Mr. Akins can answer them on Wednesday.

Writing formulas for polyatomic ion compounds: o
Determine what ions you have (simple ions or polyatomic ions) o ____________________ the ions charges
○ Easiest way to do this is the ______________________ method, also known as the drop and swap method. o
IF there is a polyatomic: Put the entire polyatomic ion and its subscript in the parenthesis.
○ “Cage the Beast”: put ALL polyatomic ions in parenthesis, no matter how many you have.
○ The video will say this is optional, but for me you are required to cage the beast. It will help you not make mistakes. o
IF there is more than one of that polyatomic needed to balance the charges, put the whole polyatomic ion in parenthesis, and put the swapped charge (usually the cation’s number outside of the parenthesis.
○ *the video words this funny, the subscript attached to the polyatomic on your list, stays inside the parenthesis with the ion. The new number, usually from the cation, goes outside the parenthesis.
○ Example #1: ____________________
○ Show your work:
○ Formula: _________________________
○ Example #2: ______________________
○ Show your work:
○ Formula:_______________________
*I want you to use the parenthesis around all polyatomic ions until further notice. You do not have to use the 1, unless you feel more comfortable doing so.

Pause the video and complete the following table:
Complete the following table:
Compound Name:
Lithium Nitrate
Magnesium sulfate
Calcium sulfite
Sodium phosphate
Ions:
Li +1
Mg
Ca
Na
( NO
3
+2
+2
+1
(SO
4
)
(SO
(PO
4
3
)
)
)
-2
-2
-3
-1
Compound Formula:
 Naming Ionic Compounds with Polyatomic Ions: o
Naming is just like it is for simple ionic compounds and ionic compounds with transition metals. o
Name the ___________ with the elements name, as it appears on the periodic table
○ Exception: if you ammonium (NH
4
) you will use the name of the polyatomic o Name a single (___________________) anion, like before change the ending to ______. o Name a polyatomic ion, right off the polyatomic list: DO NOT CHANGE THE ANIONS
NAME, if it is a polyatomic ion. o
Example: _____ and ______ compound formula: _______________ o * You do not have to know hydrogen carbonate, it is not on your list, either. But still copy down here work in the space below:
Complete the following table: I will post the answers to both tables, later in the nearpod lesson.
Ionic Compound Formula:
(NH
4
)(NO
3
)
Ionic Compound Name:
Sr
3
(PO
4
)
2
Zn(NO
2
)
2
*hint: Zinc is a transition metal.
Mg(CO
3
)
*Complete the homework assignment attached to this note taking guide.