An AB3 molecule is described as having a trigonal-bipyramidal electron-domain geometry. a. How many nonbonding domains are on atom A?

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insert step 1> Identify the electron-domain geometry of the molecule. In this case, it is given as trigonal-bipyramidal.

insert step 2> Understand that a trigonal-bipyramidal geometry involves five electron domains around the central atom.

insert step 3> Recognize that the molecule is described as AB3, meaning there are three bonding domains (B atoms) around the central atom A.

insert step 4> Calculate the number of nonbonding domains by subtracting the number of bonding domains from the total number of electron domains: 5 (total domains) - 3 (bonding domains) = 2 nonbonding domains.

insert step 5> Conclude that there are 2 nonbonding domains on atom A in this AB3 molecule with a trigonal-bipyramidal electron-domain geometry.

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Trigonal-Bipyramidal Geometry

Trigonal-bipyramidal geometry occurs when a central atom is surrounded by five electron domains, which can be bonding or nonbonding. In this arrangement, three domains are positioned in a plane at 120-degree angles, while the other two are above and below this plane, forming 90-degree angles with the equatorial domains.

Electron Domains

Electron domains refer to regions around a central atom where electrons are likely to be found. These can include bonding pairs (shared between atoms) and lone pairs (nonbonding). The number of electron domains determines the molecular geometry and influences the angles between bonds.

Nonbonding Domains

Nonbonding domains, or lone pairs, are pairs of valence electrons that are not involved in bonding with other atoms. In the context of molecular geometry, these domains can affect the shape and angles of the molecule, as they occupy space and repel bonding pairs, leading to adjustments in the overall geometry.