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https://doi.org/10.1351/goldbook.I03276
Two or more @[email protected] are described as isoelectronic if they have the same number of @[email protected] electrons and the same structure, i.e. number and @[email protected] of atoms, but differ in some of the elements involved. Thus: CO, N2 and NO+ are isoelectronic. CH2=C=O and CH2=N=N are isoelectronic.
CH3COCH3
and
CH3N=NCH3
have the same number of electrons, but have different structures, hence they are not described as isoelectronic.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1128 [Terms] [Paper]