According to CFT, Ni2+ can have two unpaired electrons in :
Both octahedral and tetrahedral geometry
Ni2+ = 3d8
Octahedral: t2g6eg2 = 2 unpaired electrons
Tetrahedral: e4t24 = 2 unpaired electrons
Square planar: dx2-y2 left empty, all 8 electrons paired = 0 unpaired
In octahedral and tetrahedral fields the last electrons sit singly in a degenerate set by Hund's rule, but the large energy gap below the dx2-y2 orbital in a square planar field forces complete spin pairing, making that geometry diamagnetic.
Hence, Both octahedral and tetrahedral geometry.
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.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
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