Why is the second electron gain enthalpy of Oxygen positive??

Question:I need a basic explanation. Simpler the better.
Thanks guys!

:)

Answers:
http://www.teachmetuition.co.uk/atomic_s...

http://www.amscopub.com/images/file/file...

http://www.lcc.ukf.net/chem13/mod2quans.

http://www.chm.bris.ac.uk/~paulmay/misc/...

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