1. The problem statement, all variables and given/known data (c) the ionization energy of Cl- _________kJ/mol (e) the electron affinity of Cl+ _________kJ/mol Ionization Energy Chart I(sub1) I(sub2) I(sub3) I(sub4) I(sub5) Cl 1255 2295 3850 5160 6560 2. Relevant equations 3. The attempt at a solution At first when I saw the Cl-, I thought maybe they added an extra electron to become Ar and I used the Ionization Energy (I sub1) for Ar but it wasn't right... I was wondering if there are any difference between getting the Ionization Energy of Cl+ and Cl? I mean the book gave me the chart of I (sub1) to I (sub7) of Cl but nothing about the ions of Cl. Is there an equation or anyway where you could figure out the energy? (same question regarding electron affinity) P.S. Yay! First post!!