Purpose ; To use the data collection, to build graphs of the variation of a property against the atomic number. 1) Graphing lonization energy In this exercise you will plot a graph of ionization energy against the atomic number of the elements. You will examine the graph to find out whether there are any regular variations in the property. Using the data given in the Table(next page) plot the graph for the ionization energy against the atomic number. Join consecutive points with solid straight lines. When datum for an element is missing, join the points by a broken straight line