Advertisements
Advertisements
प्रश्न
Aluminium crystallises in a cubic close-packed structure with a unit cell edge length of 353.6 pm. What is the radius of Al atom? How many unit cells are there in 1.00 cm3 of Al?
Advertisements
उत्तर
Using the formula (i),
r = 0.3535 a
∴ r = 0.3535 × 353.6 = 125 pm
Using the formula (ii),
Number of unit cells in volume (V) of metal = `"V"/"a"^3`
∴ Number of unit cells in 1.00 cm3 of Al = `1.00/(3.536 xx 10^-8)^3`
= 2.26 × 1022
- Radius of Al atom (r) is 125 pm.
- Number of unit cells in 1.00 cm3 of Al is 2.26 × 1022.
APPEARS IN
संबंधित प्रश्न
Choose the most correct answer.
In crystal lattice formed by bcc unit cell, the void volume is _______.
The coordination number of atoms in bcc crystal lattice is ______.
Answer the following in one or two sentences.
Sketch a tetrahedral void.
How are tetrahedral and octahedral voids formed?
Third layer of spheres is added to second layer so as to form hcp or ccp structure. What is the difference between the addition of third layer to form these hexagonal close-packed structures?
The number of tetrahedral voids are formed if the number of atoms in a crystal is N/2.
The number of octahedral voids formed in 0.5 mol of a compound forming hcp structure?
In hexagonal close packed (hep) structure, ____________ layer and ____________ layer have horizontal and vertical alignment.
A metal crystallizes in bcc lattice with edge length 4.48 Å. The radius of the metal atom is ___________ Å.
The ratio of close-packed atoms to tetrahedral holes in cubic close packing is ____________.
A metallic element crystallises in simple cubic lattice. If edge length of the unit cell is 3Å, with density 8 g/cc, what is the number of unit cells in 100 g of the metal?
(Molar mass of metal = 108 g/mol)
Xenon crystallises in fcc lattice and the edge length of unit cell is 620 pm. What is the radius of Xe atom?
In two dimensional AAAA type packing, the coordination number of each sphere is ____________.
The coordination number of Rh in the complex [Rh(NH3)3(SCN)3] is ____________.
Which of the following is CORRECT for the two dimensional arrangement of spheres given below?
Zinc forms hcp structure. What is the number of tetrahedral voids formed in 0.3 mol of it?
The atoms of element 'Y' form hexagonal close packing and the atoms of element X occupies `3/4` th portion of the number of tetrahedral voids. The formula of the compound formed by X and Y is ____________.
Zinc forms hcp structure. What is the number of octahedral voids formed in 0.2 mol of it?
Percentages of free space in cubic close-packed structure and in the body-centered packed structure are respectively ______.
Which metal crystallises in a simple cubic structure?
The coordination number of cobalt in the complex [Co(en)2Br2]Cl2 is ______.
Find the total number of tetrahedral and octahedral voids formed in 1 mole of a compound forming hcp structure.
