Identify the correct statement regarding crystalline and amorphous solids

Identify which of the following elements is NOT a conductor or semi-conductor

i. Ti

ii. Cu

iii. Ge

iv. N

v. Si

Which of the following is the type of packing depicted in the illustration below?

Identify the three-dimensional primitive lattice that satisfies the property below: 

Has an internal angle of 120°C and is equal on two dimensions. 

(i) tetragonal

(ii) rhombohedral 

(iii)  triclinic

(iv) orthorhombic

(v) hexagonal

(vi) monoclinic

For the simple cubic unit cell, identify each of the following: 

i. the number of atoms

ii. fraction of each atom in the cube

iii. Total number of atoms inside the cube

Lithium has body-centered cubic structure and has a density of 0.534 g/mL which is much less than water. This means that it should float on water which has a density of approximately 1 g/mL at room temperature. Calculate the density of Li if the structure was a cubic close-packed structure and identify if it would still float on water.

Chromium adopts a body-centered cubic unit cell with a density of 7.19 g/cm³

Identify each of the following: 

i. the number of atoms per cm³

ii. the number of unit cells present per cm³

iii. the volume of a unit cell

iv. the edge length (Choose one below) 

For the body-centered cubic unit cell, identify each of the following: 

i. the number of corner atoms

ii. fraction of each corner atom in the cube

iii. number of body atoms

iv. fraction of each body atom in the cube

v. Total number of atoms inside the cube

A sample of metal was determined to have a density of 8.96 g/cm³. The metal crystallizes in a face-centered cubic cell and using X-ray diffraction the edge length was measured to be 362 pm. Determine the atomic weight, atomic radius, and identity of the metal.

Arrange the crystal lattice structures in order of increasing packing efficiency. 

i. Face-centered cubic

ii. Hexagonal close packed 

iii. Body-centered cubic

iv. Simple-cubic

For the face-centered cubic unit cell, identify each of the following: 

i. the number of corner atoms

ii. fraction of each corner atom in the cube

iii. number of body atoms

iv. fraction of each body atom in the cube

v. Total number of atoms inside the cube