Aluminium crystallizes in an fcc structure. Atomic radius of the metal is 125 pm.
How many such unit cells are there in 1 `m^3` of aluminium?

Explanation

To find the number of unit cells in 1 m³ of aluminum, which crystallizes in a face-centered cubic (FCC) structure, we can follow these steps:

### Step 1: Convert the atomic radius from picometers to meters
The atomic radius of aluminum is given as 125 pm (picometers). We need to convert this to meters.

\[ \text{Atomic radius (r)} = 125 \, \text{pm} = 125 \times 10^{-12} \, \text{m} \]
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