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Q.

Electronic configurations of four elements A, B, C and D are given below.  (A)      1s22s22p6  (B)    1s22s22p4  (C)   1s22s22p63s1  (D)   1s22s22p5           Which of the following is the correct order of increasing tendency to gain electron?

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a

A

b

A

c

D

d

D

answer is A.

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Elements with less than octet gain electrons D and B, A has octet,
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Electronic configurations of four elements A, B, C and D are given below.  (A)      1s22s22p6  (B)    1s22s22p4  (C)   1s22s22p63s1  (D)   1s22s22p5           Which of the following is the correct order of increasing tendency to gain electron?