¹⁵Building on the amphitheater analogy for one atom of the element aluminum, we could say that there are two electrons occupying the “s” seating row on the first level, plus two electrons occupying the “s” seating row on the second level, plus six electrons occupying the “p” seating row on the second level, plus two electrons occupying the “s” seating row on the third level, plus one electron occupying the “p” seating row on the third level.