Question

with the exception of he, how many valence electrons do noble gases have? a. 3 b. 4 c. 6 d. 8

Explanation:

Step1: Recall noble - gas valence - electron rule

Noble gases (except He) have a full outer shell. The outer - shell electron configuration for non - He noble gases is \(ns^{2}np^{6}\), which gives a total of 8 valence electrons. Helium has only 2 valence electrons as its electron configuration is \(1s^{2}\). The question asks for non - He noble gases.

Answer:

D. 8