Today, my first day of teaching practice. However, today I was late for class because I attended the flag ceremony at the university office. The practice of teaching this was my first experience, which I had never really taught before.  I teach in class 8.3, the first day I teaching chemistry. The material taught is about the atom, to teach this material I use several media. one of the media used is the solar system model to explain the concept of atoms. At the beginning of the lesson, I gave students questions about the atom. then I explain about the concept of atoms, after I explained students did a discussion about the concept of atoms with solar system modeling. they are very passionate about working