Question

Maximum number of atom in plane in i2cl6 is 8 and have 3c-4e bonds in structure

Answer 1

The particle itself has high symmetry, like D2h, that should be fulfilled in the sub-atomic orbital or valence bond depiction. That is the reason one can't recognize the crossing over chlorine bonds.  

Because of symmetry reasons, you just should be worried about two bonds. The external I−Cl bond is enraptured 93% towards the chlorine, however just involved by 1.25 electrons. The staying 0.75 electrons can be found in against holding solitary match orbitals. This isn't close at all to expected Lewis structure conduct. The connecting I−μClI−μCl bond is as yet 81% enraptured towards the chlorine and has a control of 1.92 electrons. This just helps us to know, that this bond has a higher mutual sharing characteristic.