Consider the transition metal ions Mn 3+, Cr 3+, Fe 3+ and Co 3+ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the co

Question

Consider the transition metal ions Mn 3+, Cr 3+, Fe 3+ and Co 3+ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is

(A) Cr 3+ > Fe 3+ > Co 3+ > Mn 3+
(B) Mn 3+ > Fe 3+ > Co 3+ > Cr 3+
(C) Fe 3+ > Co 3+ > Mn 3+ > Cr 3+
(D) Cr 3+ > Mn 3+ > Fe 3+ > Co 3+

Prashant Kotian · Accepted Answer

Correct answer: D. Co 3+ → 3d 6 2,2,2 0,0 2g g t e ,unpaired electron = 0 Fe 3+ → 3d 5  2,2,1 0,0 2g g t e unpaired electron = 1 Cr 3+ → 3d 3  1,1,1 0,0 2g g t e unpaired electron = 3 Mn 3+ → 3d 4  2,1,1 0,0 2g g t e unpaired electron = 2

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