Which One of the Following Statements About Unit Cells and Packing

question 58

Multiple Choice

Which one of the following statements about unit cells and packing in solids is incorrect?

• A)In any unit cell of a solid crystal, each face of the cell must have an opposite face which is equal and parallel to it.
• B)The faces of a unit cell must all be at angles of 90° to each other.
• C)The coordination number of atoms in a close packed metal is 12.
• D)The packing efficiency in fcc structures is higher than in bcc structures.
• E)The packing efficiency in fcc and hcp structures is the same.

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Definitions:

Highly Substitutable

Referring to goods or services that can be easily replaced or exchanged with others of similar value or function.

Centrality

The importance, prominence, or influence of something or someone within a certain context or network.

Subunit Power

The degree of influence or control a subsection of an organization has over decisions or resources.

Not-Sanctioned Means

Methods or measures that are not officially approved or authorized, often implying unconventional or illicit approaches.