Advertisements
Advertisements
प्रश्न
A compound crystallizes in bcc structure. What is unit cell edge length if diameter of its atom is 120 pm?
Advertisements
उत्तर
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
संबंधित प्रश्न
What is the covalency of nitrogen in N2O5?
Give an example each of a molecular solid and an ionic solid.
Ionic solids conduct electricity in molten state but not in solid state. Explain
Explain ionic solids are hard and brittle.
Copper crystallises into a fcc lattice with edge length 3.61 × 10−8 cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm−3.
Answer the following in brief.
Distinguish between ionic solids and molecular solids
A compound is made up of two elements X and Y and crystallizes in bcc structure. Atoms of X are present at the corners of the cube. Atoms of Y are present at the centre of the cube. The formula of the compound is ______.
Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
Classify the following solid:
Pb
The ionic radii of A+ and B− are 0.98 × 10−10 m and 1.81 × 10−10 m. The coordination number of each ion in AB is ______.
Give any three characteristics of ionic crystals.
Classify the following solid.
Brass
Classify the following solid.
NaCl
____________ is an example of molecular crystal.
Fullerene is an example of ____________.
Which among the following is an example of network solid?
Brass is an example of ____________.
Solid X is a very hard electrical insulator in solid as well as in molten state. It melts at extremely high temperature. Solid X is a ____________.
The hardest substance among the following is:
How many chloride ions are surrounding sodium ions in sodium chloride crystal?
Which of the following is not true about the ionic solids?
Which of the following cannot be regarded as molecular solid?
(i) SiC (Silicon carbide)
(ii) AlN
(iii) Diamond
(iv) I2
Inspite of long range order in the arrangement of particles why are the crystals usually not perfect?
Calculate the angle at which first order reflection will occurs in an X-ray spectrometer when x ~ rays of wavelength \[\ce{1.54 \overset{\circ}{A}}\] are diffracted by the atoms of a crystal given that inter planer distance is \[\ce{0.04 \overset{\circ}{A}}\]
Which of the following molecules is non-polar in nature?
Which of the following is not correct?
Graphite is a ______.
