Electronic configurations of four elements A, B, C and D are given below :(A) 1s2 2s2 2p6(B) 1s2 2s2 2p4(C) 1s2 2s2 2p6 3s1(D) 1s2 2s2 2p5 (br>Which of the following is the correct order of increasing tendency to gain electron :

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Electronic configurations of four elements A, B, C and D are given below :<br>(A) 1s2 2s2 2p6<br>(B) 1s2 2s2 2p4<br>(C) 1s2 2s2 2p6 3s1<br>(D) 1s2 2s2 2p5 (br>Which of the following is the correct order of increasing tendency to gain electron :