The Valence shell electron pair repulsion (VSEPR) model provides a useful basis for understanding and molecular geometry. Thus, it is worthwhile understanding of its physical basis. One very interesting specific case of VSEPR model: WH6 will be provided and the factor that controls the �non-VSEPR� structure will be discussed in detail. At last, the comparison between the molecular structure of WH6 and WF6would promote our understanding of bonding between �non-VSEPR� and VSEPR molecule. Here we attempt to provide this paper based on the following main parts: 1) The Pauli principle is the physical basis of the VSEPR model; 2) The metal d orbital participation in s bonding is an important factor controls the distorted metal complexes; 3)Ligand electrostatic repulsion disfavors the �non-VSEPR� arrangements especially when the ligand has more negative charge or non-bonding electron pairs.Fig 1. the C3v structure of WH6Fig 2. the Oh structure of WF6

Discussion on one specific case in VSEPR: WH<sub>6</sub>

245th National Meeting (2013)

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Discussion on one specific case in VSEPR: WH6

Discussion on one specific case in VSEPR: WH₆