Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351 pm, the atomic radius of the lithium will be
(a) 240.8 pm
(b) 151.8 pm
(c) 75.5 pm
(d) 300.5 pm
Which of the following statements is not correct?
(a) The fraction of the total volume occupied by the atoms in a primitive cell is 0.48
(b) Molecular solids are generally volatile
(c) The number of carbon atoms in an unit cell of diamond is 4
(d) The number of Bravais lattices in which a crystal can be categorized is 14
Concept Questions :-
If 'a' stands for the edge length of the cubic systems: simple cubic, body centered cubic and face centered cubic, then the ratio of radii of the spheres in these systems will be respectively,
Percentage of free space in a body centered cubic unit cell is
(a) 30% (b) 32%
(c) 34% (d) 28%
With which one of the following elements silicon should be doped so as to give p-type of semiconductor?
The fraction of total volume occupied by the atoms present in a simple cube is:
Copper crystallises in a face-centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm?
The number of octahedral void(s) per atom present in a cubic close-packed structure is
A metal cryszallizes with a face-centered cubic lattice. The edge of the unit cell is 408 pm.
The diameter of the metal atom is
(a) 288 pm
(b) 408 pm
(c) 144 pm
(d) 204 pm
if a is the length of the side of a cube, the distance between the body centered atom and one corner atom in the cube will be :-
(a) 2 a (b) 4 a (c)√3 a (d)√3 a
√3 √3 4 2