Here's how to write formulas for binary ionic compounds. We'll see how you have to balance the charges of the two ions so they cancel each other out.

We'll learn how to write formulas for ionic compounds that contain transition metals. The transition metals are unique because they are elements are able to make multiple ions with different charges. We use roman numerals to indicate the charge of a transition metal ion. To write a formula for an ionic compound with transition metals, we make sure that the positive charge of the cation and the negative charge of the anion balance out.

We'll learn what polyatomic ions are. Polyatomic ions are created when a number of atoms come to together to form a group, and then that group has either a positive or a negative charge, which means that it can be either a cation or an anion. We discuss how protons and electrons balance to give a net charge, and then discuss some common polyatomic ions.

Here's how to write formulas for ionic compounds that contain polyatomic ions. In order to write formulas for polyatomic ions, you have to look at a chart or table of polyatomic ions to find out what the charge of each one is. Then, you figure out how many other ions will be necessary to balance out the charges and make it neutral.