It is found in group 8, but it is a bit different than all other elements found in this group. It does not have 8 valence electrons because it doesn't even have that many! There are a total of 2 electrons in Heliums outer shell, but that is a full outer shell due to it being the first orbital.

Unlike the other Noble gases found in group 8, Helium doesn't bond because 2 outer electrons are all it needs. It is the one exception to needing 8 electrons for it's outermost shell.