Final answer:
Elements in Group 0, or Noble Gases, all have eight electrons in their outer shell, except for Helium which has two. This full electron configuration contributes to their stability and minimal reactivity with other elements.
Step-by-step explanation:
The elements found in Group 0 of the Periodic Table, also known as Noble Gases, all have eight electrons in their outer shell, with the exception of Helium, which only has two. This state of having full electron shells contributes to their stability and their lack of reactivity with other elements. Thus, with the exception of Helium, elements in Group 0 adhere to the 'Octet Rule', which states that atoms gain stability when their outermost shell has eight electrons. The full outer shell of electrons gives these elements stability and makes them less reactive.
Learn more about Noble Gases