Question

The electrons trapped in anion vacancies in metal excess defects are called (a) Mobile electrons (b) Trapped electrons (c) Valence electrons (d) F-centres

Answer 1

Answer:(d)

Explanation:When electrons are trapped into the crystalline anion vacancy the defect is known as. ... The lattice sites containing the electrons trapped in the anion vacancies are called F-centres because they are responsible for imparting colour to the crystals (F=Farbe which is a German word for colour).