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Electronic configuration of valence shel...

Electronic configuration of valence shell of four elements, `A,B,C` and D are?
(A) `ns^(2),np^(2)` (D) `ns^(2),np^(3)`
(B) `ns^(2),np^(4)` (D) `ns^(2),np^(5)`
Arrange them in increasing order of `IE_(2)`:

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