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Are there similar blanks on the modern periodic table between magnesium and aluminum?
The blanks on are because of the order that electrons fill the energy levels.
The first 2 electrons fill the first orbital, the second orbital holds 8 more electrons for a total of 10 electrons. The third orbital can hold up to 18 electrons however, after 8 are placed in that orbital, 2 must be placed in the fourth orbital, then continue filling the third .