Suppose you have an element X which has the following ionization energies: 11 -589.5 kJ/mol, 12 =1145 kJ/mol, 13=4900 kJ/mol, 14 = 6500 kJ/mol, and 15 = 8100 kJ/mol. This values of ionization energies estimated that the unknown element is CI Ca OS o As OKr OS