Problem 28
Polonium crystallizes in a simple cubic structure. The edge of the unit cell is \(0.236 \mathrm{~nm}\). What is the radius of the polonium atom: (a) \(0.144 \mathrm{~nm}\) (b) \(0.156^{\circ} \mathrm{nm}\) (c) \(0.118 \mathrm{~nm}\) (d) \(0.102 \mathrm{~nm}\)
Problem 29
Lithium crystallizes as body centered cubic crystals. If the length of the side of unit cell is 350 \(\mathrm{pm}\), the atomic radius of lithium is: (a) \(303.1 \mathrm{pm}\) (b) \(606.2 \mathrm{pm}\) (c) \(151.5 \mathrm{pm}\) (d) \(123.7 \mathrm{pm}\).
Problem 30
Gold has a face centered cubic lattice with an edge length of the unit cube of \(407 \mathrm{pm}\). The diameter of the gold atom is: (a) \(576.6 \mathrm{pm}\) (b) \(287.8 \mathrm{pm}\) (c) \(352.5 \mathrm{pm}\) (d) \(704.9 \mathrm{pm}\)
Problem 31
The neon atoms has a radius of \(160 \mathrm{pm}\). What is the edge of the unit cell of a face centered structure of neon? (a) \(490 \mathrm{pm}\) (b) \(320 \mathrm{pm}\) (c) \(453 \mathrm{pm}\) (d) \(481 \mathrm{pm}\)
Problem 32
What are the number of atoms per unit cell and the number of nearest neighbours in a simple cubic structure? (a) 1,6 (b) 4,12 (c) 2,8 (d) 2,6
Problem 33
What are the number of atoms per unit cell and the number of nearest neighbours in a face centered cubic structure? (a) 4,8 (b) 2,8 (c) 2,6 (d) 4,12
Problem 34
What are the number of atoms per unit cell and the number of nearest neighbours in a body centered cubic structure? (a) 4,12 (b) 1,6 (c) 2,8 (d) 2,5
Problem 37
The density of argon (face centered cubic cell) is \(1.83 \mathrm{~g} / \mathrm{cm}^{3}\) at \(20^{\circ} \mathrm{C}\). What is the length of an edge a unit cell? (Atomic weight: \(\mathrm{Ar}=40\) ) (a) \(0.599 \mathrm{~nm}\) (b) \(0.569 \mathrm{~nm}\) (c) \(0.525 \mathrm{~nm}\) (d) \(0.551 \mathrm{~nm}\)
Problem 40
The face centered cubic cell of platinum has a length of \(0.392 \mathrm{~nm}\). Calculate the density of platinum \(\left(\mathrm{g} / \mathrm{cm}^{3}\right):\) (Atomic weight : \(\mathrm{Pt}=195\) ) (a) \(20.9\) (b) \(20.4\) (c) \(19.6\) (d) \(21.5\)
Problem 42
An element crystallizes in a face centered cubic lattice and the edge of the unit cell is \(0.559\) \(\mathrm{nm}\). The density is \(3.19 \mathrm{~g} / \mathrm{cm}^{3}\). What is the atomic weight? (a) \(87.6\) (b) \(79.9\) (c) \(85.5\) (d) \(83.9\)
