What are the electronic shells?

The electrons rotate around the nucleus at different levels, similar to the target circles for archery. These levels are called electronic shells. Each shell can have only a certain number of electrons. Their number at the external level determines how one or another atom interacts with the neighboring ones. An atom whose outer shell is completely filled (for example, an argon atom), is not connected to adjacent atoms (inert). An atom in which the outer shell does not have one or more electrons (for example, an oxygen atom), actively reacts.

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