Gold (atomic radius = 0.154 nm ) crystallizes in a face centred unit cell. What is the length of a side of the cell.

Explanation

To find the length of a side of the face-centered cubic (FCC) unit cell for gold, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Data:**
- Atomic radius of gold (R) = 0.154 nm.

2. **Understand the Structure of FCC:**
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