How to Find Isoelectronic and Isostructural?

Isoelectronic species have the same number of electrons which is the sum of electrons of all the atoms present in the ion. Now isostructural as the name suggests means that the ions have the same shape and arrangement. The shape is irrespective of the atoms attached to the central atom.

How do you calculate isoelectronic?

To find the isoelectronic pairs, we can just add the number of electrons of each atom and also the charge of the ion (if present) to find which of the molecules have the same number of electrons in them.

How do you identify an isostructural species?

Hint: To find the isostructural species among the given compounds, we must find the hybridisation of the central atom of each species and the arrangement of the bond pairs and lone pairs on the central atom. To do that, you must recall the VSEPR (Valence shell electron pair repulsion) theory.