The spin-only magnetic moment of the coordination compound sodium tetrachloridonickelate(II) is ______ B.M. (Nearest integer) (Given atomic number of Ni = 28 )

Step-by-step solution

The IUPAC name sodium tetrachloridonickelate(II) corresponds to the complex formula Na ₂[ NiCl ₄] . The central metal ion is Ni in the +2 oxidation state. The electronic configuration of Ni ²⁺ is [ Ar ] 3 d ^8 . Since Cl ^- is a weak field ligand, the complex is tetrahedral and the pairing of electrons does not take place against Hund's rule. The 3 d ^8 configuration has 2 unpaired electrons ( n = 2 ). The spin-only magnetic moment is given by: = n(n+2) B.M. = 2(2+2) = 8 2.83 B.M. Rounding to the nearest integer, w