The spin-only magnetic moment value of \({\mathrm{M}}^{\text{n+- }}\) ion formed among \(\mathrm{Ni},\mathrm{Zn},\mathrm…

The spin-only magnetic moment value of \({\mathrm{M}}^{\text{n+- }}\) ion formed among \(\mathrm{Ni},\mathrm{Zn},\mathrm{Mn}\) and Cu that has the least enthalpy of atomisation is _______. (in nearest integer)
Here n is equal to the number of diamagnetic complexes among \({\mathrm{K}}_{2}\left[{\mathrm{NiCl}}_{4}\right],\left[\mathrm{Zn}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]{\mathrm{Cl}}_{2}\), \({\mathrm{K}}_{3}\left[\mathrm{Mn}(\mathrm{CN}{)}_{6}\right]\) and \(\left[\mathrm{Cu}{\left({\mathrm{PPh}}_{3}\right)}_{3}\mathrm{I}\right]\)

[JEE Main 2025, 2 Apr (Shift 2)]