Question

Which element does not have the same number of electrons in its outermost shell as the other elements in its group?(1 point)
Responses

hydrogen (H
)
hydrogen ( h )

bromine (Br
)
bromine ( b r )

helium (He
)
helium ( h e )

boron (B
)

Answer 1

The element that does not have the same number of electrons in its outermost shell as the other elements in its group is **hydrogen (H)**.

Hydrogen is in Group 1 of the periodic table, but it has only 1 electron in its outermost shell, while other Group 1 elements (like lithium, sodium, and potassium) have 1 electron in their outermost shell as well but also exhibit metallic properties. Helium is in Group 18 and has a complete outer shell of 2 electrons, while bromine and boron belong to different groups (Group 17 and Group 13, respectively) with a varying number of valence electrons.