Silicon has the diamond structure with a unit cell edgelength of 5.43 Å and eight atoms per unit cell. (a) Howmany silicon atoms are there in 1 cm3 of material? (b) Supposeyou dope that 1 cm3 sample of silicon with 1 ppm ofphosphorus that will increase the conductivity by a factorof a million. How many milligrams of phosphorus arerequired?

Q: 2. ZrC has a rock salt structure (NaCl) which may be considered as two interpenetrating f.c.c.…

A: Given, The lattice of - FCC.a. To draw the unit cell and determine the no. of atoms of each type.b.…

Q: For each of the following crystalline solids, determine the number of atoms (or ions) per unit cell…

A: (a) PbS : Number of S2- ions per unit cell = 4  Number of Pb2+ ions per unit cell = 4 Coordination…

Q: What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy…

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Q: Substance Y (107.8682 amu) reflects X-rays of wavelength 154.18 pm at angles of 19.076°, 22.171°,…

A: This is a question from solid state chemistry. We have to use following three formulae to figure out…

Q: When cadmium oxide reacts to form cadmium selenide, a change in unit cell occurs, as depicted below:

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Q: In the provided unknown unit cell structure: atom (X) spheres occupy the octahedral holes. (1) How…

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Q: How many total cations (A and B) and anions (X) are there in the unit cell below? = A = B = X

A:

Q: calculate the density of each of the following metals from the information given; (a) Aluminum…

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Q: An element with density 10 g cm-3forms a cubic cell with edge length of 3 X 10-8 cm. What is the…

A: Given: Density of element          = 10 g cm-3 Edge length of unit cell   = 3 x 10-8 cm Atomic mass…

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A: To determine the atomic packing factor of hafnium with hexagonal closed-packed (hcp) crystal…

Q: Metallic nickel crystallizes in a face-centered cubic lattice, with one Ni atom per lattice point.…

A: This problem is based on solid state. Here, we are given a face centred cubic lattice (F.C.C.…

Q: 1. For the HCP crystal structure, show that a) The volume of the unit cell is given by 6√3R²c. b)…

A: The structure of the HCP unit cell is shown below,  Figure 2 is the large representation of the…

Q: Show that your calculation of number of atoms in a unit cell (⅛, ¼, ½, 1 added together support the…

A: NaCl shows a FCC type  Structure In FCC  Na is of small size so na occupy the  octahedral  voids…

Q: In XCI, which crystallizes in CsCl structure, one edge of the unit cellis found to be 370.8 pm.…

A:

Q: 4- The unit cell of 52Cr²4 metal is BCC, if the density of Cr= 7.19 Mg/m³; determine the lattice…

A: Here we have to use the formula to calculate the density of unit cell, through which we can…

Q: Choose the correct alternative that NaCl presents. (a) the total number of atoms in the unit cell…

A: For FCC Unit cell, number of atoms per unit cell = 4   Nad is Fcc Structure, So number of atoms…

Q: Aluminium (Al) has a face-centered cubic structure, with lattice parameter a = 4.05 × 10−10 m. If…

A: Data

Q: In their book X-rays and crystal structures (which begins ‘It is now two years since Dr. Laue…

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Q: letter d only thank you

A: Since in part c you have calculated density of Aluminium atom = 3.66 g/cm3  And It is given that 26…

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A: We know Crack is a BCC(body centre cubic) structure . In BCC structure eight atoms are present at…

Q: A sample of an alkali metal that has a b.c.c. unit cell is found to have a mass of 1.000 g and a…

A: Answer: Alkali metal are present in the 1st group of periodic table and among all the metals they…

Q: What is the chemical formula for the ionic compound whose unit cell is shown? (A and B are cations;…

A:

Q: In XCI, which crystallizes in CsCl structure, one edge of the unit cellisfound to be 3708 pm Using…

A: Given: Edge length(a)=370.8 pm The radius of Cl-= 181 pm

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A: In a unit cell, atoms are present at corner, faces and edges depending upon the type of unit cell.…

Q: (d) Doping can be used to increase conductivity of the substances, explain with examples. What are…

A: Doping increases the conductivity as follows.

Q: Iron has a body-centred cubic unit cell with a cell edge of286.65 pm. The densityof iron is 7.874 g…

A: A lattice is an ordered array of points describing the arrangement of particles that form a…

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Q: A compound of cadmium, tin, and phosphorus is used in the fabrication of some semiconductors. It…

A: Assume x be the number of phosphide ions present in the lattice. Hence, the number of tetrahedral…

Q: 1. For the HCP crystal structure, show that a) The volume of the unit cell is given by 6√3R²c. b)…

A: The HCP crystal lattice is shown as- The hexagonal closed structure has 2 lattice parameters,…

Q: In terms of band theory, what is the difference(i) between a conductor and a semiconductor?(ii)…

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Q: l crystallizes in a body–centered lattice with the unit cell measuring 4.58 A°…

A: The body-centered lattice has atoms present at each corner of cube and one atom at centre of…

Q: What is the packing factor if the radius of Ga is 0.62 Å and of As is 1.51 Å? (A) 0.74. (B) 0.68.…

A: Rg and for Ra and are atomic radius (in Å) for Ga and As respectively. Rg = 0.62 Å (given) Ra = 1.51…

Q: The density of copper metal is 8.95 g cm-3. If the radius of copper atom is 127.8 pm, is the copper…

A: The density is the ratio of mass and volume. Density (d) of the unit cell is given by using the…

Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.