Which of the following elements has the smallest first ionization energy?
A)Rb
B)Mg
C)I
D)As
E)F

Question

Quizplus · Accepted Answer

Rb (Rubidium) has the smallest first ionization energy among the options given. This is because it is located in the alkali metal group (Group 1) and has a single electron in its outermost shell, which is further away from the nucleus compared to the electrons in the other elements listed. This makes it easier to remove that electron, resulting in a lower first ionization energy.

Which of the Following Elements Has the Smallest First Ionization