isoelectronic

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i·so·e·lec·tron·ic

 (ī′sō-ĭ-lĕk-trŏn′ĭk, -ē′lĕk-)
adj.
Having equal numbers of electrons or the same electronic configuration.

isoelectronic

(ˌaɪsəʊɪlɛkˈtrɒnɪk)
adj
(Chemistry) (of atoms, radicals, or ions) having an equal number of electrons or a similar configuration of electrons

i•so•e•lec•tron•ic

(ˌaɪ soʊ ɪ lɛkˈtrɒn ɪk, -ˌi lɛk-)

adj.
noting or pertaining to atoms and ions having an equal number of electrons.
[1925–30]