1. The problem statement, all variables and given/known data I was to calculate the Fermi Wave Vector $K_F$ for a metallic structure then explain why the nearly free elctron model is consistent with its behaviour? 3. The attempt at a solution After calculating the wave vector, I see that the fermi wave vector is within an energy band, hence the energy band is only partially filled allowing easy promotion of electrons into higher energy states.. Allowing for easy conduction? Would this explain why the nearly free electron model is consistent?