In covalent bonding, valence electrons are shared between two atoms. 

The driving force for diffusion is concentration.

A large angle grain boundary has a higher energy than the equivalent small angle grain boundary.

The Burgers vector of a screw dislocation is parallel to the dislocation line.

Bonus problem 3 (1 point each). Write the Exact Title of the following chapter.  (it should be the exact title. Upper or lower case letters do not matter)

(Chapter 6)-

Diffusion flux is defined as mass diffusing per unit time.

Bonus problem 2 (1 point each). Write the Exact Title of the following chapter.  (it should be the exact title. Upper or lower case letters do not matter)

(Chapter 5)-

When two atoms are separated by their equilibrium distance, the net force, namely the sum of repulsive (negative) force and attractive (positive) force, is minimum.