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The electronic configuration for some ne...

The electronic configuration for some neutral atoms are given below :
(i) `1s^(2),2s^(2),2p^(6),3s^(2)` (ii) `1s^(2),2s^(2)2p^(6),3s^(1)`
(iii) `1s^(2),2s^(2)2p^(6),3s^(2)3p^(2)` (iv) `1s^(2),2s^(2)2p^(6),3s^(2)3p^(3)`
Which of these is expected to have the highest second ionization enthalpy ?

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