Group II of the PT

Officially Helium belongs to group II, becaus it has two valency electrons in the outmost orbital.
But, as we have seen, Helium has, just like Hydrogen, only one main orbital with these two valency electrons. The first main orbital is full! No more electrons allowed there. Helium cannot have more.
In short: Helium is perfectly content with those two electrons and will not have the least tendency to change that. He will not donate nor capture electrons.
Helium does not react at all, is a noble gas. That's why we mostly do not place Helium in the second main group of the PT, but in group VIII, toghether with the other noble gases.

The second main group contains the elements Be till Ra (2s2). These elements want donate two electrons and are rather reactive, although less than the elements in the first main group.