I created this worksheet to help my students master the ability to properly write out the formulas for ionic bonds between metals and non metals. This is a double sided worksheet with a key included. I have used this worksheet for years and always found it very helpful. It builds them to the point of practicing writing the equations after they have answered review questions. It also includes a detailed example/explanation of how to write out the formula.
You might also want to check out my notes on chemical bonding (I have a bundle of all three- ionic, metallic, covalent as well as selling them individually) and my worksheet on practicing covalent bonds. All can be found in the chemistry section of my store.