Which of the following shapes does not represent a 6 electron domain?

Question

BlackTom AI · Accepted Answer

To tackle this question, begin by recalling the concept of electron-domain geometry: the shape around a central atom is determined by the total number of electron domains (bonding and lone pairs). A six-electron-domain scenario corresponds to AX6 arrangements.

Option a. Octahedral: An octahedral geometry arises when there are six electron domains around the central atom (e.g., AX6). Therefore, this shape does represent a 6 electron domain.

Option b. Square Planar: This geometry also corresponds to six electron domains in the typical AX4E2 case, where two lone pairs occupy opposite positions to yield a planar arrangement of four bonds. Thus, square planar can represent a 6 electron domain scenario.

Option c. Square Pyramidal: A square pyramidal geometry is associated with six electron domains as well (AX5E1), where five bonding pairs and one lone pair create the shape. Hence, it represents a 6 electron domain.

Option d. Tetrahedral: Tetrahedral geometry occurs with four electron domains around the central atom (AX4) and is not compatible with six electron domains. This means tetrahedral does not represent a 6 electron domain.

In summary, a, b, and c all align with six electron domains in their usual contexts, while d does not, because it corresponds to only four electron domains.

CHM1051 MUM S2 2025 CHM1051 Practice Exam 2

Which of the following shapes does not represent a 6 electron domain?

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