In a given period, this group has the element with the smallest ionization energy.
A) Group 3A
B) Group 7A
C) Group 8A
D) Group 2A
E) Group 1A

Question

Quizplus · Accepted Answer

Group 1A (also known as the alkali metals) has the element with the smallest ionization energy because they have only one valence electron that is easily removed to form a positive ion. As you move across a period and from bottom to top of a group, ionization energy generally increases. Thus, elements in Group 3A, Group 7A, and Group 8A all have higher ionization energies than the alkali metals in Group 1A. Group 2A also has higher ionization energies than Group 1A because the elements in Group 2A have two valence electrons that are harder to remove than the single valence electron in Group 1A.

In a Given Period, This Group Has the Element with the Smallest