Which element has the largest first ionization energy?
A) Be
B) Ca
C) Mg
D) Sr
E) Ba

Question

Quizplus · Accepted Answer

Be (Beryllium) has the largest first ionization energy among the options given. This is because ionization energy generally increases across a period from left to right in the periodic table due to the increasing nuclear charge, which more strongly attracts the electrons in the same energy level. Be is located to the right of the other elements listed (Ca, Mg, Sr, Ba), all of which are in the same group (alkaline earth metals) but in different periods.

Which Element Has the Largest First Ionization Energy