Sodium metal (atomic weight 22.99 g>mol) adopts abody-centered cubic structure with a density of 0.97 g>cm3.(a) Use this informat ion and Avogadro’s number1NA = 6.022 * 1023/mol2 to estimate the atomic radius ofsodium. (b) If sodium didn’t react so vigorously, it couldfloat on water. Use the answer from part (a) to estimatethe density of Na if its structure were that of a cubic closepackedmetal. Would it still float on water?

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

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A: Mass density = 2.64 g cm-3 Molar mass   = 87.62 g mol-1

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

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A:

Q: Tantalum (Ta; d = 16.634 g/cm3and M = 180.9479 g/mol) has a body-centered cubic structure with a…

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A:

Q: Identify the set that contains compounds that form an ionic solid, a molecular solid, and a…

A: Option  (A) is the correct answer that is  Li2O , B2O3  , BeO.

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Q: For the shown crystal structure, write down (a) the Bravais lattice and (b) the basis of the…

A: Given that, For this structure : a=b≠c & α=β=γ=90°.

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Q: What fraction of the total volume of a face-centered cubic structure is occupied by atoms? Vsphere…

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A:

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

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.