Why can helium be placed in group II?
The reason it can be placed in group II is because it has 2
electrons in its outside shell (also its only shell) and the groups
represent how many electrons in the elements outside shell, the
reason it is normally placed in group 8 or 0 is because the first
shell has a maximum of 2 electrons and all elements that have a
full outside shell are placed in group 8/0 and can't normally