Calculate the number of states per cubic metre of sodium in 3s band. The density of sodium is `1013kgm^(-3)`.How many of them are empty?

Explanation

To calculate the number of states per cubic meter of sodium in the 3s band and to determine how many of them are empty, we can follow these steps:

### Step 1: Calculate the mass of sodium in 1 cubic meter
Given the density (ρ) of sodium is \(1013 \, \text{kg/m}^3\), we can find the mass (M) of sodium in 1 cubic meter (V = 1 m³) using the formula:
\[ M = \rho \times V \]
Substituting the values:
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