Helium only has two valence electrons and is a stable atom. How is this possible when atoms need 8 valence electron to become stable?

Explanation:

Helium (He) is similar in that it, too, only has room for two electrons in its only valence shell. Hydrogen and helium have only one electron shell. The first shell has only one s orbital and no p orbital, so it holds only two electrons. Therefore, these elements are most stable when they have two electrons.

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explanation: