In the simple cubic unit cell, what does the basis consist of? Question 17 options: One atom located at the center of the cube One atom located at each corner of the cube Multiple atoms located at random points

To answer the question step by step:

1. Understand the structure of a simple cubic unit cell:

   • A simple cubic unit cell is one of the basic types of crystal lattice structures.
   • It is characterized by atoms positioned at the corners of a cube.

2. Identify the basis in a crystal lattice:

   • The basis refers to the arrangement of atoms within the unit cell.
   • In a simple cubic unit cell, the basis consists of the atoms that are repeated in each unit cell to form the entire crystal.

3. Analyze the given options:

   • Option 1: One atom located at the center of the cube.
     • This describes a body-centered cubic (BCC) structure, not a simple cubic structure.
   • Option 2: One atom located at each corner of the cube.
     • This correctly describes the simple cubic unit cell, where each corner atom is shared among eight adjacent unit cells.
   • Option 3: Multiple atoms located at random points.
     • This does not describe a simple cubic unit cell, as the atoms are not randomly placed but are positioned at specific points (the corners).

4. Conclusion:

   • The correct answer is: One atom located at each corner of the cube.