in which of the following crystalline lattices (2 points) 1. The most efficient
ID: 548317 • Letter: I
Question
in which of the following crystalline lattices (2 points) 1. The most efficient packing of atoms is found 1) Simple Cubic Il) Face Centered Cubic Il) Body Centered Tetragonal Rhombohedral V) Hexagonal close packed a) I only b) II only c) ill only d) e) n and V only All of them 2. the following crystal structures has the largest number of atoms per unit cel? (2 points) a) Face Centered Cubic b) Simple Cubic c) Diamond Cubic d) Body Centered Cubic e) Hexagonal Close Racked 3. For the following structures, answer questions (a) to (d) below (a) What are the names of crystal I, II, and lI respectively? (3-points) (b) which crystal shows cat%nslocatedin tetrahedralinterstitial sites? (1-point) (c) Which crystal has covalent bonds? (1-point) p'ss2) Od)which crystalrepresentsli con?(Hint:electronconfigurationofSliconis1s2s2 (1-point)Explanation / Answer
Ans 1 -The answe is FCC and HCP as both have packing efficiency = 74.04 %. So the answer is D
Ans 2 - The answer is diamond cubic because It has 8 atoms per unit cell
as -
No. of atoms by the corner atoms in unit cell are 8 x 1/8 = 1 and No. of atoms by the face centred in unit cell are 1/2 × 6 = 3 andatoms present on side structure =4 ,so we can say that total number of atoms present in a diamond cubic unit cell is 1 + 3 + 4 = 8
So the answer is C
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