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Electronic configuratios of four element...

Electronic configuratios of four elements `A, B, C` and `D` are given below:
(i) `1s^(2)2s^(2)2p^(5)` (ii) `1s^(2)2s^(2)2p^(4)` (iii) `1s^(2)2s^(2)2p^(6)3s^(1)` (iv) `1s^(2)2s^(2)2p^(5)`
Which of the following is the correct order of increasing tendency of gain electron:

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