Buildup PrincipleWith each successive increase in atomic number, a given atom has onemore electron than the previous atom. Thus, it is possible to start with hydrogen and, adding one electron at a time, build up the electronic configuration of each of the other elements. In the buildup of electronic structures of the atoms of the elements, the last electron is added to thelowest-energy subshell possible. The relative order of the energies of allthe important subshells in an atom is shown in Figure 3-2. The energiesof the various subshells are plotted along the vertical axi
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