isoelectronic

[ ahy-soh-i-lek-tron-ik, -ee-lek- ]
/ ˌaɪ soʊ ɪ lɛkˈtrɒn ɪk, -ˌi lɛk- /

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.

Origin of isoelectronic

First recorded in 1925–30; iso- + electronic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for isoelectronic

isoelectronic

/ (ˌaɪsəʊɪlɛkˈtrɒnɪk) /

adjective

(of atoms, radicals, or ions) having an equal number of electrons or a similar configuration of electrons
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012