The coordination number of atoms in bcc crystal lattice is

If r is the radius of an atom and a is an edge length of fcc unit cell, then

A single substance that exists in two or more forms is called

Graphite is a

An ionic compound crystallises in FCC type structure with 'A' ions at the centre of each face and 'B' ions occupying corners of the cube. The formula of the compound is

The correct relation between edge length and radius of an atom in simple cubic lattice is_______

In Frenkel defect,

Schottky defects are observed in which solid among the following?

The coordination number of atoms in body-centred cubic structure (bcc) is

Which of the following can be used to describe a crystalline solid?

_________is the basic repeated structural unit of a crystalline solid.

Sulfur exists in two polymorphic forms_________ and _______

Which of the following statements is true for an amorphous solid?

Which type of solid structure melts at a definite, sharp melting point?