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Noble gases

The six noble gases that occur naturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).

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11y ago
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12y ago

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11y ago

all noble gases helium neon krypton xenon argon radon and ...

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Q: Which elements had a filled outermost shell?
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