Advertisements
Advertisements
प्रश्न
Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?
Advertisements
उत्तर
For a face-centred unit cell:
`a = 2 sqrt 2 r`
It is given that the atomic radius, r = 0.144 nm
So, `a = 2 sqrt 2 xx 0.144` nm
= 2 × 1.414 × 0.144 nm ...`(∴ sqrt2 = 0.414)`
= 0.407 nm
Hence, length of a side of the cell = 0.407 nm
संबंधित प्रश्न
Which is true for F-centers?
Which crystal system has axial angles equal to 90°?
Which crystal system has a ≠ b ≠ c?
The space lattice of graphite is ____________.
The total number of tetrahedral voids in the face-centered unit cell is ______.
In zinc blend structure:
The fraction of the total volume occupied by the atoms present in a simple cube is ____________.
The distance between Na– and Cl– ions in NaCl with a density 2.165 g cm–3 is __________.
A crystal has the lattice parameters a ≠ b ≠ c and α = β = γ = 90°. The crystal system is
Na and Mg crystallise in Bee and Fcc type crystals respectively. "The no. of atoms in the unit cells of their respective crystals is:
Sodium crystallises in a body-centred cubic unit cell. (bcc) with edge length 4.29 A. what is the radius of the sodium atom? What is the length of the body diagonal of the unit cell?
The density of a crystal is given by the formula
The correct option for the number of body-centered unit cells in all 14 types of Bravais lattice unit cells is ______.
The correct option for the number of body-centered unit cells in all 14 types of Bravais lattice unit cells is ______
Orthorhombic crystal has the following unit cell dimensions ______.
A certain element crystallises in a bcc lattice of unit cell edge length 27 A°. If the same element under the same conditions crystallises in the fcc lattice, the edge length of the unit cell in A° will be ______. (Round off to the Nearest Integer).
[Assume each lattice point has a single atom]
Gold crystallizes in a face-centered cubic lattice. If the length of the edge of the unit cell is 407 pm. The density of gold assuming it to be spherical is ______ g/cm3. Atomic mass of gold = 197 amu.
