Anion Vacancies and F Centres in Metal Excess Defects

The video tutorial explains non-stoichiometric defects in inorganic solids, focusing on metal excess defects caused by anion vacancies. It describes how these vacancies are filled by unpaid electrons, forming F centers that impart color to the crystals. Examples include alkyl halides like sodium chloride and potassium chloride.

What is meant by non-stoichiometric defects in inorganic solids?

Explain the concept of metal excess defects.

How does an anion vacancy contribute to the formation of a metal excess defect?

What is an F center and how does it relate to color in ionic crystals?

Discuss the significance of unpaid electrons in the context of non-stoichiometric defects.