In order to name and write formulas you must be able identify metals vs non-metals on the Periodic Table.

Metals, Nonmetals, and Metalloids on the Periodic Table

Understanding the pattern for metals and non-metals on the Periodic Table.

How to Identify Types of Chemical Compounds

The most common of chemical compounds are ionic, molecular, and ternary. This video teaches you how to identify the type of compound based on the elements present.