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- 4. Briefly explain why chemically similar alkali metal chlorides, NaCl and CsCl, have different crystalline structures, while MnS and NaCl pack in the same crystalline structure.Q915 Molybdenum has a BCC crystal structure, an atomic radius of 0.1465 nm and atomic weight of 95.94 g/mol. Compute its theoretical density.(Given: Avogadro ’s number, NA = 6.023 X 1023 atoms/mol)An element has a density of 10.25 g/cm3 and a metallic radius of 136.3 pm. The metal crystallizes in a bcc lattice. Determine its atomic weight.
- A hypothetical metal has the BCC crystal structure, a density of 7.24 g/cm3, and an atomic weight of 48.9 g/mol. The atomic radius of this metal is 0.122 nm 0.0997 nm 1.22 nm 0.154 nmA hypothetical element, Le, has a body centered cubic structure with a density of 6.93 g/cm3. Calculate its atomic radius in pm. Atomic Mass: Le: 55.963 g/mol a. 129.61 b. 131.43 c. 132.34 d. 130.52An element has a density of 10.25 g/cm3 and a metallic radius of 136.3 pm. The metal crystallizes in a bcc lattice. Identify the element.
- 3. A hypothetical element, Ny, forms a face-centered cubic lattice with an atomic radius of 166 pm. Calculate the density of the element in g/cm3. Atomic Mass: Ny: 117.947 g/mol3. If atomic radius of Ru is 205 pm and it forms hep crystalline structure, calculate the crystalline density of Ru crystal. The height of Ru is 5.2A, the width is 1 and atomic mass is 101.07 g/mol.Copper (Cu) has an fcc structure, where the mass of a Cu atom is 63 in atomic mass units.The density of Cu is 8.9×103 kgm−3.Tungsten (W) typically has a bcc structure, where the mass of a W atom is 184 in atomicmass units. The density of W is 19.3×103 kgm−3.(i) Use the above data to find the radius of a Cu atom, and of a W atom.(ii) Which atom has the larger radius, and why?You may use the fact that 1 atomic mass unit is equivalent to 1.66 × 10−27 kg.