#d8 metal ion

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[Ni(CN)4]2− (Ni₂+, d8) with strong field CN− adopts square planar geometry, unlike tetrahedral with weak field ligands.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Crystal Field Theory - CFT and Crystal Field Splitting and CFSE

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Ni₂+ (d8) in a tetrahedral field (e.g., [NiCl₄]2−) with weak field Cl− has e4 t24, 2 unpaired electrons, making it paramagnetic.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Colour and Magnetic Properties and Stability and Importance

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