Name__________________________________________
Per _______ Date _______________________
7.1 & 7.2 Practice Worksheet B
Writing Binary Ionic Formulas
Part 1: Ion Charges
Knowing the __________________ of ions is very important to
be able to write a correct formula. Fill in the charges for groups
1, 2, and 13 -18 on the periodic table to the right.
Additionally, don’t forget you are also responsible for the names
and charges of polyatomic ions.
Part 2: Writing Ionic Formulas
Now that you can effectively recall the charges of ions, you are ready to begin formula writing. Summarize the
process of how to write ionic compound formulas below.
Remember: When you have finished writing an ionic formula, the total ___________________ charge of the
cations, should equal the total ____________________ charge of the anions.
Compound Name
1. Lithium nitride
2. Strontium fluoride
3. Calcium iodide
4. Aluminum phosphide
5. Sodium oxide
6. Barium sulfide
7. Cesium chloride
Cation
Charge
Anion
Charge
Show work here
Formula
Part 3: Writing Formulas with Ions of more than one charge
Practice the following examples. Be careful! These examples contain elements with more than one charge.
Compound Name
Cation
Charge
Anion
Charge
Show work
here
Formula
1. Copper (I) fluoride
2. Copper (II) fluoride
3. Tin (IV) chloride
4. Cobalt (II) phosphide
5. Manganese (III) phosphide
6. Iron (III) oxide
7. Iron (III) sulfate
Part 4: Writing Formulas with Polyatomic Ions
Watch out! This next set of elements contains some of the hardest examples I could give because they may
contain polyatomic ions and metals with more than one charge.
Compound Name
1. Copper (I) hydroxide
2. Mercury (I) hydroxide
3. Tin (II) sulfate
4. Calcium bicarbonate
5. Manganese (III) phosphate
6. Gold (I) dichromate
7. lead (IV) cyanide
Cation
Charge
Anion
Charge
Show work
here
Formula