Molecular shape octahedral arrangement

Now you can see that the central atoms has 4 BPs and 2 LPs, a total of 6 electron groups around it. The geometric arrangement of the electron group is octahedral. For 4 BPs and 2 LPs, the molecular shape is square planar. 

Molecular Shapes with Six Electron Groups (Octahedral Arrangement)... 

Figure 10.9 The three molecular shapes of the octahedral electron-group arrangement.

Three of the five basic molecular shapes are linear, trigonal planar and tetrahedral. Table 4.9 shows the arrangement of the electron pairs (charge centres) that results in minimum repulsion and the basic shapes of the molecules. The two other basic shapes adopted by molecules, trigonal bipyramidal and octahedral, are discussed in Chapter 14. 

The valence shell of the xenon atom contains 12 electrons eight from the xenon and one each from the four chlorine atoms. There are four bonding pairs and two lone pairs. The basic shape adopted by the molecule Is octahedral. Flowever, there are two possible arrangements for the lone pairs. The first structure, square planar, minimizes the repulsion (the lone pairs are at 180° to each other) and Is hence adopted as the molecular shape (Figure 14.7). As a general rule, for a molecule where the electron domains adopt an octahedral structure, any lone pairs will occupy positions opposite to one another. 

The octahedral [SiF6]2 molecular ion, and a simple valence bond approach to explaining its formation. Overlap of a p orbital containing two electrons on each of the six fluoride anions with one of six empty hybrid orbitals on the Si(IV) cation, arranged in an octahedral array, generates the octahedral shape with six equivalent covalent a bonds. 

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