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Welcome to Profcoudert's channel, the channel that explains your physics (and chemistry!) lessons in a simple way. Let's dive into the heart of matter in the infinitely small. In this world of atoms, let's focus on a particular character: the electron. The electron is a quantum object, which means that it does not obey the same rules as you and me. And these rules in particular impose places in space where it can be: the electronic layers. This layer phenomenon is the basis of the reactivities of atoms and therefore of chemistry. Needless to say, it is important to master!