File Preview ་ 1. ང4 The crystal structure of MgO may be described as an FCC array of close packed O²- anions with Mg2+ cations at the octahedral sites (the same as the NaCl structure). Given that the ionic radii of O2 and Mg2+ are 0.140 nm and 0.072 nm, respectively, compute the density of MgO assuming ions are in contact along: (i) the unit cell face diagonals and (ii) the unit cell edges. (b) The reported density for MgO is 3.6 g/cm³. Comment on the agreement or disagreement with your results in part (a). Why do you believe one estimate is better than the other.

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Vanadium (V) has a BCC crystal structure. The atomic radius is R = 0.132 nm and the atomic mass is M = 50.94 g/mole. What is the density of Vanadium in g/mm3? Given: Avogadro’s Number NA = 0.6023 × 1024 (atoms/mole) Select one: a. 1.5 b. 0.021 c. 0.011 d. 0.0087 e. 0.00597

Sodium chloride (NaCl) has the rock salt crystal structure and a density of 2.17 g/cm³. The atomic weights of sodium and chlorine are 22.99 g/mol and 35.45 g/mol, respectively. (a) Determine the unit cell edge length. nm (b) Determine the unit cell edge length from the radii in the table below assuming that the Nat and Cl- ions just touch each other along the edges. nm Cation Mg2+ Fe2+ Na+ Ionic Radius (nm) 0.072 0.077 0.102 Anion Ionic Radius (nm) CI- 0²- 0.181 0.140

1. Calculate the number of iron atoms in a 1000kg of iron.  2. Calculate the volume in a cubic centi meters occupied by one mole of boron.

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e. 19.28 Clear my choice Scandium (Sc) has the Face-Centered Cubic (FCC) crystal structure. The edge length is a = 0.452 nm. What is the linear density in atoms/nm along direction [110]? Select one: O a. 5.66 O b. 8.00 O c. 3.128 O d. 4.00 O e. 7.48 Lithium (Li) has the Body-Centered Cubic (BCC) crystal structure shown in the figure below. The radius of the Iis r= 0 152 nm. 11:01 PM

Zinc hasthe hexagonal close-packed crystal structure. The lattice parameters for zinc are a = 0.26648 nm and c = 0.49470 nm, and the atomic radius is 0.1332 nm. Note that zinc does not have the ideal atomicpacking facto1:   a)What is the number of atoms per unit cell in the hexagonal close-packed structure?   b)Determine the atomic packing factor of the Zn unit   c)Is the c/a ratio for zinc greater than or less than the ideal HCP c/a ratio? Will slip be harder or easier in zinc compared to the ideal HCP structure? Explain your answer fully.

(b) Find planar atomic densities by considering the section of a (110) plane within a unit cell for: [Tentukan satah ketumpatan atom dengan mempertimbangkan bahagian satah (110) dalam satu sel unit untuk:) Vanadium that has BCC crystal structure and atomic radius of 0.136 nm, as shown in Figure 1 (a). [Vanadium yang mempunyai struktur kristal BCC dan jejari atom 0.136 nm seperti ditunjukkan dalam Rajah 1 (a). ] (i) (ii) Copper that has FCC crystal structure and atomic radius of 0.145 nm, as shown in Figure 1 (b). [Kuprum yang mempunyai struktur kristal FCC dan jejari atom 0.145 nm seperti ditunjukkan dalam Rajah 1 (b).1 (110) Plane (110) Plane within an within an FCC unit cell BCC unit cell (a) (b) Figure 1 |Rajah 1|