Question

except for helium (he), how many electrons do the noble - gases have in their outermost orbit (valence electrons)?
o 2
o 6
o 8
o 10

Explanation:

Noble gases, except for helium, have a full outer - shell of electrons. The maximum number of electrons in the outermost shell for elements beyond the first energy level is 8. Helium has 2 valence electrons as its outer shell is the first energy level which can hold a maximum of 2 electrons. But for other noble gases like neon, argon, etc., the outer shell holds 8 electrons.

Answer:

8