Which of the following elements has the highest ionization energy? by Sunday | Mar 16 | Chemistry WAEC | 0 comments A. Calcium B. Chlorine C. Flourine D. Magnesium Correct Answer: Option D – Magnesium Users Also Read These:Which of the following substances has the highest…How are ionization energies related to the…Which of the following Group 1 elements has the…Explain the meaning of Ionization energy. - NABTEB QUESTIONWhich of the noble gases has the greatest ionization energy?