Which of the group 3A elements is the only one to readily form a +1 ion?
A)B
B)Al
C)In
D)Tl

Question

Quizplus · Accepted Answer

Tl (thallium) is the only element in Group 3A that can readily form a +1 ion. This is due to its relatively low ionization energy and the fact that it has a single electron in its outermost shell that it can easily lose, forming a stable +1 ion. The other elements in Group 3A (Boron, Aluminum, and Indium) typically form +3 ions.

Which of the Group 3A Elements Is the Only One