Carbon has the highest ionization energy as its energy 1086KJ\Mol and the rest are between 500 and 800.
In my opinion the answer is D
<span>The student is incorrect because helium has 2 valence electrons and it's in group 18 because the first energy level is full. Although helium is placed in Group 18 which generally has 8 valence electrons, it does not have 8 valence electrons as the student suggested. It was grouped together with the noble gases because it exhibits similar properties with them. </span>
