K2PtCl6 is known but K2NiCl6 is not known.State the reason.
I guess it's to be answered comparing the stability of Pt4+ and Ni4+ but I am somehow unable to distinguish.Please help me out.
Platinum has large size with vacant orbital which can form complex of coordination number 6, while the size of nickel is small, which cannot hold 6 ligand at a time therefore does not show K2NiCl6.