A plane belongs to the {111} family. What is the planar density of figure in the body-centered cubic (BCC) system as a function of a, the edge length of the unit cell?

Sketch the following planes and directions within a cubic unit cell

1. Simple Cubic Unit Cell (b) Fig 5. Simple Cubic (SC) Unit Cell. (a) Ball-and-Stick Model (b) Space-filled Model (c) Stacking (a) a. Each corner atom of the unit cell would be shared by how many unit cells? Answer: b. Assuming the atoms as perfect spheres, how much of a corner atom is used by just a single unit cell? Answer: c. If there are atoms at the eight corners of a simple cubic cell and each atom is shared by eight unit cells, how many total atoms are there per simple cubic unit cell? Answer:

Why are there no more than 7 crystal systems ? What are quasicrystals ?

2.) A newly designed superconductor material has 3 different types of atoms in its molecular formula and has a crystal structural similar to diamond cubic with an additional atom at the body-center (like BCC). Atom A orients on the 8 vertices of the cubic lattice and at the body center. Atom B orients at the center of each face. Atom C orients at 4 tetrahedral sites residing entirely within the cubic lattice. Each cubic crystal lattice has precisely the number of atoms that matches the molecular stoichiometry: AxByCz. What is the stoichiometry of this material?

1.List the point coordinates for all atoms that are associated with the FCC unit cell.

Q1/A B) Describe the Bohr model of hydrogen atom. What are the shortcomings of the Bohr model? Prove that the atomic packing factor (APF) for the BCC crystal structure is 0.68.

Please don't provide handwritten solution ......

he only example of an element with this structure? . What is meant by the term coordination number in the structure of a solid? How does he coordination number depend on the structure of the metal?