We thrown this term molecule, so we need to set the framework and the foundation for a few terms that we are going to use when we discuss what happens in certain chemical reactions. So couple things about molecules and molecular compounds. When two or more atoms are bound together, or when they're bound together chemically. They form a molecule. So there's some type of chemical interaction going on that holds these atoms together forming a molecule. Molecules are presented. By chemical. Formulas. So when these atoms come together to form a molecule, we need to come up with some type of convention to do that. We call those chemical formulas. There's a couple more definition terms here. A molecule made up of only two atoms is called a diatomic molecule. And then going off of that, compounds. Composed. Of molecules containing. More. Than one type. Of atom. Are called. Molecular. Compounds. And we can represent these, and we'll give a couple examples. So the examples we'll give, is we'll give a chlorine molecule. Which is represented as CL2. We will refer to this as a diatomic molecule, because it contains two chlorine atoms that are chemically bound together. If we look at something like methane, which is CH4, we refer to this as a molecular compound. And a molecular compound is a molecule comprised of more than one type of atom. So here we have a carbon bound to four hydrogen, whereas over here on the left we have two chlorines, chlorine atoms that form a chemical bond between them. So, this gives us a foundation of what molecules are and what molecular complexes are. You're gonna notice as we go through the course, when we refer to molecular compounds, it's typically gonna be a non metal bound to another non metal.