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Why is helium in group 18 on the periodic table though it only has 2 valence electrons?

Why is helium in group 18 on the periodic table though it only has 2 valence electrons?
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Why is helium in group 18 on the periodic table though it only has 2 valence electrons?

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User Martijn De Munnik
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strictly speaking, a molecule has at least two atoms. ... Atoms with full valence electron shells are stable. Full Text[ edit ] The noble gases are a group of chemical elements that make up Group 18 on the periodic table.
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User TheSean
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