Which of the following ion has minimum value of ratio of valence electron and proton? (A) \( \ma...

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Which of the following ion has minimum value of ratio of valence electron and proton?
(A) \( \mathrm{H}^{-} \)
(B) \( \mathrm{O}^{+2} \)
(C) \( \mathrm{Cl}^{-} \)
(D) \( \mathrm{N}^{3-} \)
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