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Why is neon in the same group on the periodic table as helium?

User Pditommaso
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noble gases: helium, neon, argon, krypton, xenon, and radon. Also known as the rare gases, they once were called inert gases, because scientists believed them incapable of reacting with other elements

User Dlb
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They are both noble gases and they both have a full outer shell
User Belgther
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