The lattice site in a pure crystal cannot be occupied by :

Options

A. molecule
B. ion
C. electron
D. atom

Answer

C

Explanation

Each point in a lattice is known as lattice point which are either atom or molecule or ion which are joined together by a straight line to bring out geometry of lattice in pure crystal consitiuents are arranged in fixed stoichiometric ratio .
Hence , existance of free electrons are not possible it is possible on in case of imperfection in solid .