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Which of the following electronic config...

Which of the following electronic configurations has the lowest ionization enthalpy ?
(a) `1s^2 , 2s^2 , 2p^6`, ,(b) `1s^2 , 2s^2 , 2p^6`
(c) `1s^2 , 2s^2 , 2p^6 , 3s^2`.

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