Part B
What electron sublevel starts to fill after completion of the sublevel?
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After the completion of the sublevel, the sublevel begins to fill. This process is part of the Aufbau principle, where electrons occupy the lowest energy orbital available. So as we move through the periodic table, you’ll see that once all the electrons are in place, it’s time for some excitement!

Additionally, the filling of sublevels is not just a random occurrence; it’s a reflection of the fascinating quantum mechanical principles that govern electron arrangements. The sublevel can hold up to two electrons, and it’s this interplay of energy levels and electron configurations that leads to the unique properties of the elements found in the fifth period of the periodic table. So, sci-fi nerds can thank these sublevels for all the elemental drama!