Question

what is isoelectronics ?

Answer 1

Isoelectronic refers to two atoms, ions or molecules that have the same electronic structure and the same number of valence electrons. The term means "equal electric" or "equal charge". Isoelectronic chemical species typically display similar chemical properties. Atoms or ions with the same electronic configurations are said to be isoelectronic to each other or to have the same isoelectronicity
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Answer 2

isoelectronic refers to the two atoms or molecules or of same number of valence electrons