(a) What are intrinsic semi-conductors? Give an example.
(b) What is the distance between Na+ and Cl- ions in NaCl crystal if its density is 2.165 g cm-3? [Atomic mass of Na = 23u, Cl = 35.5u; Avogadro's number = 6.0231023]
Concept Videos :-
Concept Questions :-
(a) Intrinsic semi-conductors : These are insulators at room temperature and become semi-conductors when temperature is raised, Example : silicon and germanium.
(b) Applying the formula
= , Z for NaCl is 4(fcc)
or a3 = =
a = = 56410-10 cm
a = 2 distance between Na+ and Cl- ions
Distance between Na+ and Cl- ion
= = 282 pm.