Why is the increment of second ionization energy less than the increment in eighth ionization energy

Why is the sudden high increment of second ionization energy of sodium less than the increment of eighth ionization energy in sodium? The second electron of sodium should be removed from a completely filled main energy level, and the 8th should be removed from a completely filled sub energy level, not a main energy level, so shouldn't the increment of removing the second be greater than removing the 8th? The increments are 4066 and 5379, respectively. Please help! I found this really confusing.
Explorer
Asked May 22, 2014
The eighth electron which is removed would be in a higher energy level than the second one which is removed.
chemguide11
Answered May 25, 2014

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