Elaborate on the differences between metals and noble gases. a) noble gases have a full shell of valence electrons while metals have only a few valence electrons. b) valence electrons are different - metals have a full shell while noble gases have less than half a shell. c) metals have a nearly full shell of valence electrons while noble gases have a half shell of valence electrons. d) all electrons are different - noble gases have a full shells while noble gases have greater than half shells.