Identify the element with the greatest first ionization energy.
The book says the correct answer is (B) with such an explanation:
First ionization energy is a periodic trend that increases up and to the right on the periodic table. After looking at the position of these elements on the periodic table, carbon is clearly the best answer-choice (B).
However, a chart I found on Google Images (Ionization Energy Chart) says that Cl has the greatest first ionization energy. What is right then?