Advertisements
Advertisements
Question
How many lattice points are there in one unit cell of the following lattice?
Face-centred cubic
Advertisements
Solution
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
APPEARS IN
RELATED QUESTIONS
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?
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?
Hexagonal close packed arrangement of ions is described as ____________.
The arrangement ABC ABC.... is referred to as ____________.
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 |
In the SF4 molecule, there are:
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:-
Co-ordination number of sodium ion Na+ in Nacl is:-
Which of the following is frenkal effect.
The number of tetrahedral and octahedral voids in a CCP array of 100 atoms are respectively:
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 ______.
The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in AxB. The value of x is ______. (Integer answer)
