Question

In the holosymmetric class of the Cubic System, how many more faces does the{110} form have compared to the {111 } form?

• A. 2
• B. 4
• C. 6
• D. 8

Answer 1

The Correct Option is B

The question asks about the difference in the number of faces between the {110} form and the {111} form in the holosymmetric class of the cubic system.

The cubic crystal system, also known as the isometric system, is characterized by three equal axes at right angles. In the holosymmetric class (also known as the highest symmetry class), each type of plane form is associated with a specific number of equivalent crystal faces.

In the cubic system:

• The {110} form refers to planes that intersect two of the crystallographic axes equally and the third inequitably. In the cubic system, there are 12 faces in the {110} form.
• The {111} form refers to planes that intersect all three crystallographic axes at equal lengths. In the cubic system, there are 8 faces in the {111} form.

The difference in the number of faces between the {110} form and the {111} form can be calculated as:

12 - 8 = 4

Thus, the {110} form has 4 more faces than the {111} form in the holosymmetric class of the cubic crystal system.

Therefore, the correct answer is:

• 4