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Question
How is helium different from neon and argon? How is it similar?
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Solution
The filled outer shells of Group VIIIA or the noble gases makes all me members of this family ( including Helium, Neon and Argon) the most stable of all the elements. These three elements have this property in common, a filled stable outer electron shell.
Helium having the smallest outer electron shell needs only two electrons to fill first shell.
Argon and Neon being in the second and third periods need 8 electrons to fill their outer shells.
Helium having the smallest outer electron shell needs only two electrons to fill first shell.
Argon and Neon being in the second and third periods need 8 electrons to fill their outer shells.
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