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Og is the noble gas after Rn. To go from [Rn] to [Og], you must fill four subshells (s,p,d, and f) with a total of 32 electrons. Thus, the atomic numbers of sixth and seventh period elements of the same group differ by 32 . To go from [Og] to the next noble gas, however, you would theoretically fill five subshells (s,p,d,f, and g ). How many electrons are needed to fill all five subshells? number of electrons: Element 105 in the periodic table is Db. Determine the atomic number of the element just below Db in the periodic table. atomic number