Which element exhibits the greatest number of different oxidation states? (A) O (B) La (C) Rb (D) Mg (E) N

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Nitrogen
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E
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(E)
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Its Nitrogen bcoz N has a half-filled p orbital which is more stable than a p-orbital with 4 electrons occupying it as a pair
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O
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A
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E . Nitrogen exhibits a wide range of oxidation states from -3 to +5
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E)N
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