Fabiola220
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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