Identify the metal ions among Co ²⁺, Ni ²⁺, Fe ²⁺, V ³⁺ and Ti ²⁺ having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired electrons present in the high spin octahedral complexes formed by those metal ions is _ _ _ _ .

Step-by-step solution

The spin-only magnetic moment is given by = n(n+2) BM, where n is the number of unpaired electrons. For > 3.0 BM, n must be 3 (since for n=2 , = 8 2.83 BM and for n=3 , = 15 3.87 BM). Electronic configurations and unpaired electrons ( n ) in high spin octahedral complexes: Metal Ion Configuration n (BM) Co²⁺ [Ar] 3d^7 3 3.87 Ni²⁺ [Ar] 3d^8 2 2.83 Fe²⁺ [Ar] 3d^6 4 4.90 V³⁺ [Ar] 3d^2 2 2.83 Ti²⁺ [Ar] 3d^2 2 2.83 The metal ions with > 3.0 BM are Co²⁺ ( n=3 ) and Fe²⁺ ( n=4 ). The sum of unpaired electrons for these io