Which element in the alkali group will have the lowest first ionization energy?

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

The clouds are grey and ground is wet. a quantitative b qualitative

What is the independent variable in this investigation? mass volume sample number substance density