Question

noble gases do not react with other elements because their valence shells are already ________. atoms \want\ to be stable · how do they get stable? · by filling their valence shells (outermost shells) - octet rule · by being like noble gases - who do not react with other elements because their valence shells are already full · by gaining electron to fill a shell or by losing electrons to get rid of a shell exposing a full one underneath helium has 2 electrons in the outermost shell. these atoms have 8 electrons in the outermost shell. helium, he neon, ne argon, ar krypton, kr empty half full full

Explanation:

Noble gases are stable and unreactive as their valence shells have the maximum number of electrons they can hold, which is 2 for helium and 8 for the others, following the octet rule. So their valence shells are full.

Answer:

full