Advertisements
Advertisements
Question
A compound crystallizes in bcc structure. What is unit cell edge length if diameter of its atom is 120 pm?
Advertisements
Solution
Given: Type of unit cell is bcc.
Diameter of atom = 120 pm = 120 × 10-10 cm
To find: Unit cell edge length (a)
Formula: For bcc unit cell, r = `(sqrt3"a")/4`
Calculation: Radius of atom (r) = `"Diameter of atom"/2`
`= (120 xx 10^-10 "cm")/2`
= 60 × 10-10 cm
Using formula,
a = `(4"r")/sqrt3 = (4 xx 60 xx 10^-10 "cm")/1.732`
= 1.386 ×10-8 cm = 138.6 pm
Unit cell edge length is 138.6 pm.
APPEARS IN
RELATED QUESTIONS
Explain the basis of similarities between metallic and ionic crystals.
Explain ionic solids are hard and brittle.
Account for the following :
o-nitrophenol is more steam volatile than p-nitrophenol.
Classify the following solid:
Pb
Graphite and diamond are ____________.
Classify the following solid.
P4
Classify the following solid.
NaCl
If NaCl is doped with 10−2 mol percentage of strontium chloride, what is the concentration of cation vacancy?
Which of the following is an example of molecular solid?
Order of increasing melting points among H2O(s), C(s), CS2 and Sn is ____________.
What type of interaction hold the molecules together in a polar molecular solid?
Which among the following is an example of non-polar molecule?
The hardest substance among the following is:
The compound, found in nature in gas phase but ionic in solid state is ____________.
An example of a covalent crystalline solid is ____________.
Among solids, the highest melting point is exhibited by ____________.
Which of the following exists as covalent crystals in the solid state?
The major binding force of diamond, silicon and quartz is ____________.
NaCl type crystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying ____________.
How many chloride ions are surrounding sodium ions in sodium chloride crystal?
An excess of potassium ions makes KCl crystals appear violet or lilac in colour since:
(i) some of the anionic sites are occupied by an unpaired electron.
(ii) some of the anionic sites are occupied by a pair of electrons.
(iii) there are vacancies at some anionic sites.
(iv) F-centres are created which impart colour to the crystals.
A crystal with a ≠ b ≠ c and α = β = γ = 90° is
Which of the following exists as covalent crystals in the solid state?
Mention the res of the following solid:
Ice
Mention the res of the following solid:
CO2
Quartz is which type of crystal?
