Leis an líon céanna leictreon. Samplaí d'adaimh agus iain isileictreonacha is ea O2-, F-, Ne, Na+ is Mg2+, a bhfuil 10 leictreon i ngach ceann acu. Is móilíní isileictreonacha iad CO2 is N2O, 22 leictreon i ngach ceann acu.[1]
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