Which Noble Gas Does Not Have 8 Electrons in Its Outer Shell?
Discover why helium is the only noble gas that does not have 8 electrons in its outer shell and how it achieves stability with 2 electrons.
144 views
Helium (He) is the noble gas that does not have 8 electrons. It has only 2 electrons in its outer shell. Unlike other noble gases, Helium achieves stability and a full outer shell with just 2 electrons due to its position in the first period of the periodic table.
FAQs & Answers
- Why does helium have only 2 electrons in its outer shell? Helium has only 2 electrons because it is in the first period of the periodic table and achieves stability with a full outer shell of just 2 electrons, unlike other noble gases which have 8.
- Do all noble gases have 8 electrons in their outer shell? No, helium is the exception; it has only 2 electrons in its outer shell, while all other noble gases have 8 electrons, fulfilling the octet rule.
- What makes helium stable with only 2 electrons? Helium's stability arises from its small atomic number and position in the first period, where having 2 electrons fills its only energy level, satisfying the duet rule.