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There are two possible structures for a square planar molecule with a formula of AX3Y. In one structure, the Y atom is in the center and the three X atoms are arranged around it. In the other structure, one of the X atoms is in the center and the Y atom and the other two X atoms are arranged around it.
I guess I would first make 2 types of clarifications for this questions. First- We have to make the distinction between molecule geometry which is usually sort of what you see in a Lewis dot structure (2D), to molecule shape which is where VSEPR comes in (3D) Second- AX?, AX-(what), AX3, AX5, AX4... Either way usually in VSEPR, each X is trying to get as much space as possible in a 3D form, thus a tetrahedral form will be preferred over a square planar. Each X will be approximately 109.5 degrees apart from each other, instead of 90 degrees.
lCl3 = T- shaped XeF4 =Square planar SF4 =Seesaw H20 =Bent XeF2 =Linear
Drawing a energy level diagram is simple. All you have to do is draw a graph and place the value of the energy.
square planar
Because,(i) Ni(II) have d8 electronic configuration, which strongly favors square-planar complex formation;and dmg on loosing one acidic proton favors the square-planar arrangement makes the formation of [Ni(dmg)] complex favorable (ii) Because d8 configuration is stabilized most in square-planar geometry (due to high CFSE) the formation of complex becomes more favorable which adds to the driving force of the complex formation.
square planar
square planar
XeF4 is square planar
Square Planar
square planar
Square planar
c) pt(nh3)2cl2
square planar
Square Planar