Correct option is D
· Elements belonging to the same group in the periodic table have the same number of electrons in their outermost shell, also known as valence electrons.
· This similarity in the electron configuration gives these elements similar chemical properties.
· For example, all elements in Group 1 (alkali metals) have one electron in their outermost shell, while elements in Group 17 (halogens) have seven electrons in their outermost shell. The number of valence electrons determines how elements interact and bond with other elements.
