$(a)\;O^{2-} < N^{3-} < S^{2-} < P^{3-} \qquad(b)\;O^{2-} < P^{3-} < N^{3-} < S^{2-} \qquad(c)\;N^{3-} < O^{2-} < P^{3-} < S^{2-} \qquad(d)\;N^{3-} < S^{2-} < O^{2-} < P^{3-} $

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