Metals Under the free electron model, the electrons in a metal can be considered to form a Fermi gas. The number density of conduction electrons in metals ranges between approximately 1028 and 1029 electrons/m3, which is also the typical density of atoms in ordinary solid matter. This number density produces a Fermi energy of the order of 2 to 10 electronvolts.
Metals Under the free electron model, the electrons in a metal can be conside:red to form a Fermi gas. The number density of conduction e.lectrons in metals ranges between approximately 1028 and 1029 electrons/m3, which is also the typical density of atoms in ordinary solid matter. This number de!nsity produ,ces a Fermi energy of the order of 2 to 10 electr!onvolts.