"0"^^ . . . . "107478429"@en-us . "a grouping of electrons surrounding the nucleus of an atom; \"the chemical properties of an atom are determined by the outermost electron shell\""@en-us . . . "107959659"^^ . . "electron shell"@en-us . "electron shell"^^ . "07959659-n"^^ . . . "0"^^ . . .