Fabiola220 Fabiola220

06-10-2016
Chemistry

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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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Аноним Аноним

08-10-2016

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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