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28 August, 04:07

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

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  1. 28 August, 07:11
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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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