Question

explain the" free electron theory "of metallic bond?​

Answer 1

Answer:

The valence electrons of metallic atoms are free to move in the spaces between ions from one place to another place within the metallic specimen similar to gaseous molecules so that these electrons are called free electron gas.

Explanation:

The free-electron theory pertains to metals. Different from crystals, biomolecules, and other materials where the electrons of each atom or ion are localized and confined to the neighborhood of its nucleus or else shared or donated to a neighboring atom -- in a metal, the free electrons in the outer shell are non-localized, but rather are shared by all the atoms in the metal. In metals, the free electrons form what is termed an "electron gas". The properties of this "electron gas", where the free electrons flow freely among and around all the atoms of the metal, well explain the metal's properties such as thermal and electric conductivity as well as resistance. Now, in semiconductors (such as silicon and germanium), the electrons behave differently, which explains their useful properties for designing transistors, diodes, photocells, etc

Answer 2

The treatment of a metal as containing a gas of electrons completely free to move within it. The theory was originally proposed in 1900 to describe and correlate the electrical and thermal properties of metals.