In graph theory, a planar graph is a graph that can be embedded in the plane, i.e., it can be drawn on the plane in such a way that its edges intersect only at their endpoints. In other words, it can be drawn in such a way that no edges cross each other.
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No.No.No.No.
flat & non-flat
XeF4 is square planar
Trigonal Planar
Trigonal Planar bent!