electron shell

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Noun1.electron shell - a grouping of electrons surrounding the nucleus of an atom; "the chemical properties of an atom are determined by the outermost electron shell"
group, grouping - any number of entities (members) considered as a unit
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The software offers two kinds of invention experiments: Synthesis Mode--where virtual synthetic reactions are performed using a library of generic reactions and library of reactants and result in ideas having a virtual synthetic pathway to allow assessment of synthetic feasibility--and Dream Mode, where 28 different molecular change operators are used to access a wider universe of chemistry and ensures structures are chemically reasonable and obey valency rules.