Of the following,which element has the highest first ionization energy?
A)Li
B)F
C)Cs
D)At

Question

Quizplus · Accepted Answer

Fluorine (F) has the highest first ionization energy among the given elements as it has the smallest atomic radius and the highest effective nuclear charge. The effective nuclear charge is the attractive force that the outermost electron experiences from the nucleus, and it increases from left to right across a period of the periodic table. Therefore, it requires more energy to remove an electron from the outermost shell of fluorine than from the other given elements.

Of the Following,which Element Has the Highest First Ionization Energy