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Electronic configurations of four elements A, B, C and
\( \mathrm{P} \) \( \mathrm{D} \) are given below :

W.
(i) \( 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} \)
(ii) \( 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{4} \)
(iii) \( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1} \)
(iv) \( 1 s^{2} 2 s^{2} 2 p^{5} \)
Which of the following is the correct order of increasing tendency to gain electron :
(1) (i) \( \) (iii) \( \) (ii) \( \) (iv) (2) (i) \( \) (ii) \( \) (iii) \( \) (iv)
(3) (iv) \( \) (ii) \( \) (iii) \( \) (i) \( \quad \) (4) (iv) \( \) (i) \( \) (ii) \( \) (iii)
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