[ahy-soh-i-lek-tron-ik, -ee-lek-]
adjective Physics, Chemistry.
noting or pertaining to atoms and ions having an equal number of electrons.
noting or pertaining to atoms, radicals, or ions having either an equal number of electrons or an equal number of valence electrons.

1925–30; iso- + electronic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isoelectronic (ˌaɪsəʊɪlɛkˈtrɒnɪk)
(of atoms, radicals, or ions) having an equal number of electrons or a similar configuration of electrons

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It is isoelectronic with cyanide and disrupts oxidative metabolism in a similar manner.
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