Trigonal planar electron-group arrangement

Figure 10.5 The two molecular shapes of the trigonal planar electron-group arrangement.

What type of central-atom orbital hybridization corresponds to eadi electron-group arrangement (a) trigonal planar, (b) octahedral (c) linear, (d) tetrahedral (e) trigonal bipyramidal ... 

Trigonal planar (often called triangular planar) The geometric arrangement that keeps three electron groups as far apart as possible. It leads to angles of 120° between the groups. 

Molecular Shapes with Three Electron Groups (Trigonal Planar Arrangement)... 

Lewis structures can be used to explain and predict the shapes of molecules. The basic assumption is that, if the core of an atom is effectively spherical (as for most atoms it is), groups of electrons in the Lewis shell (single bond pairs, double-bond quartets, fractional bond pairs, etc.) get as far apart as possible. Thus, two groups take up a linear arrangement, three a trigonal-planar one, four tetrahedral, five trigonal-bip5Tamidal, six octahedral, and so on. 

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