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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References in periodicals archive ?
stage June & October 2002 Yes 16-cell June & October 2002 No Shells forming February 2003 No Hatched November 2003 No Hatched November 2003 Yes No fertilization November 2003 Both D-shell (2) November 2003 (3) Yes Hatched July 2004 Yes Few hatched July 2004 Yes No development August 2006 No Hatched (1) Mussels were either maintained together or kept in separate containers during induction of spawning.
The scanner's communication, power and input/output interfaces reside in a removable wiring base that is available in two versions: a fully sealed IP-65 version for wash-down applications and a version with D-shell connectors for quick connectivity.