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## Main Question or Discussion Point

To find the Fermi energy I need to find the electron density of the material and that I can do by finding the density of atoms in the material in some instances this same density.

From what I gather it's not always that way Sometimes you have to multiply a certain number

For example, aluminum should double in 3 the density of atoms to know the density of electrons.

I want to know how I know when I need to double? How much I need to double?

Thank you

From what I gather it's not always that way Sometimes you have to multiply a certain number

For example, aluminum should double in 3 the density of atoms to know the density of electrons.

I want to know how I know when I need to double? How much I need to double?

Thank you