What is the degree of freedom mean?

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram

Idon’t know how to solve this question

If two atoms are bonded to a central atom with no lone pairs,how will they be arranged