McMaster University
Mc Master University: Chemistry: Ionic Bonds
This site gives a brief description of bonding in ionic compounds.
Sophia Learning
Sophia: Ionic Compounds: Formulas From Binary Compound Names: Lesson 5
This lesson will demonstrate how to write a chemical formula for a binary ionic compound when given the systemic name. It is 5 of 5 in the series titled "Ionic Compounds: Formulas from Binary Compound Names."