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## Homework Statement

The movovalent metal Na (sodium) has the body-centred cubic structure with a unit cell side length of 4.23 x 10^-10 m

What is the free electron density of sodium?

## Homework Equations

## The Attempt at a Solution

I used:

n = (6.02 x 10^23)(density of sodium) / (atomic mass) = 2.54 x 10^28 m^-3

But isnt this the number of atoms per unit volume not free electron density?

Thanks.