Lithium, sodium, potassium and rubidium crystallize in the bcc/fcc structure.

Explanation

To solve the question regarding the crystallization of Lithium, Sodium, Potassium, and Rubidium in the BCC (Body-Centered Cubic) structure, we can break down the information step by step.

### Step-by-Step Solution:

1. **Identify the Crystal Structure**:
- The question states that Lithium, Sodium, Potassium, and Rubidium crystallize in the BCC structure.

2. **Understanding BCC Structure**:
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