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Why Cr³+ with coordination number 6 always form inner complex and Ni²+ outer complex?
Cr3+ ion has vacant 3d orbital while Ni2+ ion does not have sufficient 3d orbitals to accomodate 6 ligands. That is why Cr3+ forms d2sp3 hybridised complexes in coordination no 6 while Ni2+ forms sp3d2 complex in six coordination no
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