I am doing a theoretical study of Platinum and I don't understand why It can do 4 bonds, If your electron configuration is 5d86s1. I need to understand because of the paramethers of charge and spin multiplicity.
Platinum is one of the "especial" metals. The metals with configuration d10 in general are planar-square. This happening is explained for the crystal field theory, see the web for a short explanation.
I hope it help you and if you need more specific explication, feel free to contact me.