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Electronic configurations of four elements \( \mathrm{A}, \mathrm{B}, \mathrm{C} \), and \( \mathrm{D} \) are given below:
(a) \( 1 s^{2} 2 s^{2} 2 p^{6} \)
(b) \( 1 s^{2} 2 s^{2} 2 p^{4} \)
(c) \( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1} \)
(d) \( 1 s^{2} 2 s^{2} 2 p^{5} \)
Which of the following is the correct order of increasing tendency to gain electron:
(a) a \( \) c \( \) b \( \) d
(b) a \( \) b \( \) c \( \) d
(c) \( \mathrm{d}\mathrm{b}\mathrm{c}\mathrm{a} \)
(d) \( \mathrm{d}\mathrm{a}\mathrm{b}\mathrm{c} \)
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