Which of the following statements is true regarding interstitial voids?
They increase the density of a solid
They decrease the stability of a solid
They affect the electrical conductivity of a solid
They do not affect the properties of a solid
Interstitial voids can affect the electrical conductivity of a solid. If foreign atoms or ions occupy the interstitial voids, they can introduce impurity levels in the band structure of the crystal lattice, which can affect the electrical conductivity of the solid. This phenomenon is often used to modify the electrical properties of semiconducting materials.