Explanation:

CsCl (Cesium Chloride) Structure:
The CsCl structure is a simple cubic arrangement of Cs+ and Cl- ions. In this structure, each Cs+ ion is surrounded by 8 Cl- ions forming a cube, and each Cl- ion is surrounded by 8 Cs+ ions also forming a cube. Cs+ and Cl- ions are arranged in a one-to-one ratio to maintain electrical neutrality.

Coordination Number:
The coordination number is the number of ions or atoms that surround an ion or atom in a crystal lattice. In the CsCl structure, the coordination number of Cs+ ions is the number of Cl- ions that surround each Cs+ ion.

First Nearest Neighbors:
In the CsCl structure, each Cs+ ion is surrounded by 8 Cl- ions, which are its first nearest neighbors. These Cl- ions are located at the corners of the cube surrounding the Cs+ ion.

Second Nearest Neighbors:
To determine the number of Cs+ ions that occupy second nearest neighbor locations of a Cs+ ion, we need to consider the Cs+ ions that are adjacent to the first nearest neighbor Cl- ions. Each Cl- ion has 6 Cs+ ions as its second nearest neighbors.

Answer:
Therefore, the number of Cs+ ions that occupy second nearest neighbor locations of a Cs+ ion in the CsCl structure is 6.

Summary:
In the CsCl structure, each Cs+ ion is surrounded by 8 Cl- ions as its first nearest neighbors. Each Cl- ion has 6 Cs+ ions as its second nearest neighbors. Hence, the correct answer is (b) 8.