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Four successive members of the first row transition elements are listed below with atomic number. Which one of them have higher number of unpaired electrons ?

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Fe (Z = 26)

Co (Z = 27)

Cr (Z = 24)

Mn (Z = 25)

answer is C.

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Detailed Solution

Fe: 4s²3d⁶ (no. of unpaired electrons, n=4)

Co: 4s²3d⁷ (n=3)

Cr: 4s¹3d⁵ (n=6)

Mn: 4s²3d⁵(n=5)

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