The table shows the first, second, and third ionization energies of four elements of Period 6. One of the elements is a noble gas. Use the information in the table to complete the sentences. An element may be chosen more than once or not at all. Ionization Energy (IE) kJ/mol First IE Second IE Third IE Element 1 812 1862 2634 Element 2 376 2234 3203 Element 3 503 965 3458 Element 4 1037 2064 2837 The noble gas is most likely Element Choose... . Of the four, Element Choose... has the largest atomic radius. The element which would form cations with a 2+ charge is Choose... .