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in Classification of elements and periodicity in properties by (69.2k points)
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The electronic which will exhibit maximum no. of oxidation states 

(a)  1s2 2s2 2p6 3s2 3p5 

(b)  1s2 2s2 2p6 3s2 3p6 4s2 3d5 

(c)  [Xe] 4f14 5d6 6s2 

(d)   [Ar] 4s2 4p4

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