In the periodic table, elements in the same group have the same number of electrons in their outermost shell. Among the options provided, helium (He) is the element that does not have the same number of electrons in its outermost shell as the other elements in its group.
Helium has 2 electrons in its outermost shell, while hydrogen (H), even though it is placed above it in Group 1, has 1 electron. The other elements (bromine and boron) belong to different groups and have their own distinct outer electron configurations, but aren't relevant for this specific question.
So, the correct answer is helium (He).