Advertisements
Advertisements
प्रश्न
How many lattice points are there in one unit cell of the following lattice?
Face-centred cubic
Advertisements
उत्तर
Lattice points in an fcc lattice = 8 corners + 6 face centres
= 14
No. of particles per unit cell = `(8 xx 1/8) + (6 xx 1/2)`
No. of particles per unit cell = 4
संबंधित प्रश्न
What is the two dimensional coordination number of a molecule in square close packed layer?
A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?
A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3rdof tetrahedral voids. What is the formula of the compound?
Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.
- What is the length of the side of the unit cell?
- How many unit cells are there in 1.00 cm3 of aluminium?
Match the type of packing given in Column I with the items given in Column II.
| Column I | Column II |
| (i) Square close packing in two dimensions |
(a) Triangular voids |
| (ii) Hexagonal close packing in two dimensions |
(b) Pattern of spheres is repeated in every fourth layer |
| (iii) Hexagonal close packing in three dimensions |
(c) Coordination number 4 |
| (iv) Cubic close packing in three dimensions |
(d) Pattern of sphere is repeated in alternate layers |
How can you best describe the elongated octahedral structure of blue vitriol, CuSO4.5H2O?
The crystal system of a compound with unit cell dimensions a = 0.387, b = 0.387 and c = 0.504 nm and α = β = 90° and ϒ = 120° is
Total no. of voids in 0.5 mole of a compound forming hexagonal closed packed structure are:-
A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?
Co-ordination number of sodium ion Na+ in Nacl is:-
The number of tetrahedral and octahedral voids in a CCP array of 100 atoms are respectively:
The right option for the number of tetrahedral and octahedral voids in the hexagonal primitive unit cell is ______.
The right options for the number of tetrahedral and octahedral voids in the hexagonal primitive unit cells is ______.
The right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell is ______.
Element 'B' forms ccp structures and A occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. The structure of bimetallic oxide is ______.
Ionic radii of cation A+ and anion B- are 102 and 181 pm respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for B-. A+ is present in all octahedral voids. The edge length of the unit cell of the crystal AB is ______ pm. (Nearest integer)
What fraction of one edge centred octahedral void lies in one unit cell of FCC?
