Because of the n + l rule, the shells do not all fill before the previousshells have been completed.To write the detailed electron configuration of any atom, showinghow many electrons occupy each of the various subshells, one needs toknow only the order of increasing energy of the subshells and the maximumnumber of electrons that will fit into each (given in Table 3.4). Aconvenient way to designate such a configuration is to write the shell andsubshell designation and add a superscript to denote the number of electronsoccupying that subshell. For example, the electronic configurationof the sodium atom is written as follows:
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