1 Coordination compounds are complexes that consist of one or more central atoms or ions with one or more attached molecules. 2  The central atom is called a metal, and is a Lewis Acid; 3  The attached ions are ligands, and are Lewis Bases;  The total number of attachments between metal and ligands is the coordination number.
Stars are not scattered randomly through space, they are gathered together into vast groups known as galaxies. The Sun belongs to a galaxy called the Milky Way. Astronomers estimate there are about 100 thousand million stars in the Milky Way alone. Outside that, there are millions upon millions of other galaxies also!
Scientists estimate that there are 200 billion to 400 billion â yes, that's billion with a âb â stars in the Milky Way galaxy. Our sun is just one of those 200 billion to 400 billion stars. If that blows your mind, just wait! Our Milky Way galaxy is just one of the many galaxies in our universe.