An example of metal excess defects  is

Which of the following is transparent?

 ______________ defects appears generally in ionic crystal in which the positive and negative ions donot differ much in size.

The conductively due to the positive holes are called

The force that binds a metal ion to a number of electrons within its sphere of influence is known as

Carbon atoms in a diamond crystal are in a state of

Which of the following is extremely hard?

The number of close neighbours in a body centered cubic lattice of identical sphere is

In ______________ crystals, the units occupying lattice are positive and negative ions.

The ability of certain ultra cold substances to conduct electricity without resistance is called